@WiddlinDiddling
Of course the OP should be able to let off steam in a safe place - the fact the OP's daughter has a chronic condition does not mean the OP's own illness simply vanishes or isn't unpleasant and hard to cope with!
OP - I think you need to explain to your daughter that she needs to start being independent where she can - for example, she's perfectly capable of being in hospital by herself for some periods, she does not NEED you sleeping in a chair by her bedside 24/7, and if her chronic illness is lifelong she will need to get used to navigating hospital visits and stays - as scary as that is and as harsh as it may sound, hospitals can actually be a pretty good place for practicing being independent (she will also find that lying there whimpering and bossing folk around gets her nowhere!).
^^
This and also for many of the other pps on here.
I don't think I have anything of any use that I can add, as I think that anything I could think of has already been covered. So can I just give you my initial reaction to your O.P. OP. It was:
Bloody Hell OP I thought you were going to say something much worse than that! You have absolutely no need to feel bad about how you feel. You have a really nasty sounding bad case of Covid, and in reality you should be in bed with someone bringing you the things that you need, drinks, snacks, small meals, comfort foods, ice-cream (for the awful sounding sore throat), Paracetamol and Ibuprofen for your temperature and associated pains etc. Hopefully from 6.00pm that is exactly what will happen. If your DH wasn't due back soon, I think that if you had no-one who could have come and helped you (I can understand that even if you have parents near by, them being older it could be risky for them to come and help you - Covid really is the bugger that keeps on giving isn't it) such as a good friend, or sibling, sibling in law, etc then you might have had to ask someone official to help with the children - I am sorry if that is totally unrealistic, I do know that even getting a GP to see me these days is little short of impossible!
If I wasn't disabled and have several chronic illnesses myself, and if I still lived in the West Country, I would have loved to be able to come and help you. Even when you are over Covid (and remember it could take a while, so please, at least mentally, cut yourself some slack), I don't see how you can keep going under such stressful conditions. As a pp said, can your DD go for some respite care for a week or two every 3 to 4 months. I know that wouldn't solve much, but it would give you a little break, it would also give you something to look forward to, and I am sorry to sound horrible to your DD, but if she hated it it might help her realise that on her good days she needs to do much more for herself.
If you have read this far, thank you! I am going to say a little bit about some of my chronic conditions, just to give you some idea where I am coming from, but if I have ready said too much, then please give your eyes a rest, or go on to someone else. I am giving you these now in case you are stopping 💐
Some of my chronic illnesses are Parkinson's, Severe Arthritis (which is why I am wheelchair bound), Parkinson's and Fibromyalgia. Fibromyalgia is why I am usually bed bound, apart from my Arthritis pain, the Fibromyalgia (the one that some people still don't believe in, as at the moment there are no blood tests or anything that can prove someone has Fibromyalgia) is my one condition that gives me the most pain, frustration, and almost complete lack of energy.
My DH is my carer, and because of a mixture of my conditions he has to do everything for me. That means that although in someways our partnership and little team of two has brought us even closer together, our actual fully functioning marriage (I am trying to be coy here) is no more, which saddens me greatly and probably my DH too.
What I am trying to say (very badly I know), is that if your DD's problems are anything like my Fibromyalgia ones, where whenever you do expend any energy, it then takes a long time to replenish, much longer than the original expenditure of energy took, then she has my sympathy. Yes if something else comes up while I am still recovering from the first thing, depending what it is, a presumable rush of adrenaline can 'make' me more awake again, give and give me some extra energy, but then the slump after that is even worse.
Knowing all of that, living all of that, does not give me the right to run my DH ragged, and it does not give your DD the right to exhaust you (mentally as well as physically). Yes, she is young and I am an old codger, and yes I have had most of my chance at life, so my quality of life is no-where near as important as your DD's, and yes, she is a teenager on top of all of that, with raging hormones, probably periods, and maybe a fear that she will never have a boyfriend or get married - I hope and pray for her that she will be able to do the things that are most precious to her - so it wouldn't be surprising if she does worry about it, or if you worry about it for her, but even with all that awfulness that she is going through, if she doesn't learn to protect her dearest asset, her best friend (even though she might not realise that yet), the one who will always love her unconditionally and want the best for her - even when that person is on her last legs and wants to scream and shout at her - your DD could end up in a very, lonely, miserable and scary place, if she breaks her very dear mother.
So practically, my husband gets our meals and we eat them together (most of the time - if there is a sport on that he loves and I don't, then he will go downstairs and watch it there while he eats, I have a big, swish TV up here, so I can also watch what I fancy). Quite often he will choose to read up stairs with me, or we will watch TV or films together - luckily our tastes are usually very similar - but when he wants to be doing one of his hobbies, or needs to do housework, or go shopping (so in reality, everyday), he leaves me with a well stocked cold box, snacks that don't need to be chilled eg bananas, apples, crisps etc and a flask of tea or coffee.
I also have a really nice (if you can call them nice) commode right beside my bed. It looks like a cross between a dressing table chair and a nice (I don't like the word nice, but it isn't lovely or beautiful, just nice) dining chair, but with arms. It has painted white wood, with a coloured leather cushion for when it is not being used for it's primary duty! Anyway, having it right by my bed, with a toilet roll in my bedside table draw, and wet wipes, and hand sanitiser (and handcream as my hands get very dry), I can manage myself after I have peed, to get back into my contouring bed (a good idea if your DD really is going to have a lot of bad days, but hopefully she won't (that reminds me, if she is eligible, and it sounds like she probably is, don't forget to get the VAT off any physical aids, including the contouring beds), unfortunately if it is a number 2 my husband has to help me. I hope none of that was tmi, but I wanted to let you know what we do so that my husband isn't at my beck and call all day.
Although he is brilliant and I am so grateful to him, I think if I treated my DH like your DD treats you, I would either be divorced by now and in a care home, or he would have had a mental or physical breakdown, or maybe even a heart attack! My DH and my DC know that if I become too much of a burden that I want them to put me in a home; I try not to be too much of a burden to my DH not just because I want my favourite (and only at the moment) carer to be well and happy, but also because I love him very much.
As your DD is a teenager it is quite likely that she isn't aware yet just how brilliant you are, and how much she loves you. But she should, and needs, to be aware that she has to stop being so selfish, if she wants to keep her carer both healthy and happy. Lastly, of course, if she does want the chance of having as normal a life as possible in the future, she must push herself to be more independent on her good days. Good luck OP, you are in my thoughts - as is your DD.
By the way I started this just after your post at 5.00pm, so I am aware that things have hopefully moved on by now, that your DH is back, and you are tucked up in bed. Just in case you have read this far, big apologies if nothing I have said was interesting or helpful, and if I have managed to put my big foot in it (I am apparently good at doing that), I can only apologise even more. Please have a second bunch, you deserve them 💐