Apologies in advance, this will be long.
Hello Froglegs - oh I feel for you. All I can do is give you my experience/feelings on the matter; first the similarities.
I had high blood pressure/pre-eclampsia, and carried on with my drugs for 6 months after (with DC2 only a month after). I was on antibiotics for a month or so on and off too, and had PND well, in fact, before I even had the baby, but diagnosed/medicated at 6 weeks post-partum.
I hated breastfeeding, and yet he was putting on a huge amount of weight so I clung to the fact that it was the one thing I could do well. I resented the physicality of it. So yes, it was the breastfeeding, the feeling that I was "it", no one else could do it for us, and at this stage I couldn't even think about bottles/expressing/formula. I was also made to feel more guilty (didn't need the help tbh) by my mother who went on and on and on and on about how important it was.
Tiktok, i would respectfully add that I think when you're at such a low ebb, the usual "only you can make yourself feel guilty" maxim (which I agree with normally) is off the table. Anyone can get to you with anything at that point, particularly when you're depressed (or maybe just my mother?).
I was of course completely sleep deprived, and at sea, and didn't know what day it was, which didn't help.
I had an HV for whom bfding was the answer to everything - feeling low? latch him on, crying? latch him on, odd rash? latch him on.
So in retrospect I think for us it was a sign that something was up. He did need more food. I have no idea if it's appalling to say that, but it made a difference to my baby. IF you really really aren't producing enough milk I don't think it stops them putting on weight. Mine still did, but only because of constant feeding I think now.
If this is possible, then domperidone is your friend.
Motilium is the over the counter name, but ask on here for further details if you go that path.....or look at this www.asklenore.info/breastfeeding/induced_lactation/domfaq/howlong.html and talk to your doctor (maybe take some info with you). Personally, I would suggest trying it for a week and seeing if it makes a difference, as long as the doctor can't think of another reason for a problem. It's your milk, only more of it. Beforehand, People kept saying to me, is he feeding? Well yes, he was on there non-stop, but apparently some babies pull on and off if there isn't enough milk. DS didn't, he keep chugging away!! So a helpful midwife recommended Motilium (I will never forget, Sainsbury's carpark, Christmas Eve, 7am)... Suddenly he was happy for 3-4 hours at a time, waking up only 1,2,3 times a night. That was at 10 weeks.
I've experienced this again this time, and am now taking just 2-3 tablets a day, but it's fantastic.
Back to making you feel better...by just thinking about how long it was since I last fed him (10 minutes?!), and then when there was DH around, just hand him over and, depending on the time of day, get in a warm bath for 20 minutes with a book and ear plugs, go for a short walk round the block. Didn't have to be long, but just something that made me feel a tiny bit revived.
I also found that I couldn't sleep when I took my antidepressants at night btw, so i've always taken them in the morning since then, just fyi......
If I still couldn't sleep, I'd take a paracetamol. These days I'd have a half glass of wine, but I wouldn't have done that with the first. Even a cup of chamomile tea (if you don't have hayfever/asthma in the family) might help, or boring stuff like hot milk?
Try and give yourself little rituals like that, which are just yours. First thing in the morning, DH bringing you a cup of tea.
Shower before he leaves and just DO it. I spent 6 months barely washing, which in retrospect was just stupid (not you, me).
Counselling is essential I think. I had some on the NHS and then paid for some. We stopped the mortgage for a couple of months to get some money together to pay for it. It felt that important. It was.
Good luck, and hope some of that helps. As I said, this is what worked for me, and the fact that with every day that passes, it gets marginally less wearing.
I nearly gave up completely.... but kept going to 13 months in the end.