HI, I could have written your post exactly at 11 weeks!! I am now 16 weeks and the fog is slowly beginning to clear. It is so unbelievably difficult when you are so intensely sick, and it is often underestimated just how big of an impact the physical can have on the mental. But I want to tell you you are not alone, I can relate to you 100%. Not many people will understand, unfortunately, unless they have been through it themselves, and even then I find people not always very helpful (e.g. "I got through it, why can't you", even though they mean well). There is no shame in not coping, I didn't cope very well, felt so much of a failure as a mum and unable to work at all. I didn't feel like 'me' at all. My partner does not really 'get' it, even though he tries. Nausea is like a headache, it can be mild, or it can be severe (like a migraine). You are coping amazingly in the circumstances. You are growing a human being and you are doing an amazing job!! Physically you are the exact opposite of useless, so try not to be hard on yourself.
In terms of how you might be able to feel better, the only thing I can really say is to take each day at a time. I am sure a week from now seems like a lifetime away, and you are just wondering how you can ever get there. You will. I really think you should get signed off sick. A week at least, 2 weeks even better. I was signed off - if you had a sickness bug you would be off, and that is exactly what you have but over a prolonged time. It is the exhaustion of it day after day (and night) that is the worst. Please don't take no from your doctor. Demand it if you have to.
Take small sips of icy water or fizzy drink whenever you can. For me I could start to keep food down better at about 12 weeks - eat what you can. All I can eat some days is nutella on toast - whatever it is you can stomach, have that and do not stress.
I am now starting to feel much better, and I have also recently been prescribed ondanestron (which you can take after the 1st trimester). If you still feel sick after your scan, request to take it. I have tried multiple meds, and this is the only thing that has worked for me.
Speak to your midwife, they should offer you help - talking therapies or a referral to the perinatal team. It is not right that you should feel alone. Unfortunately I understand how hard it is to fight for anything when you feel like you do.
Try to talk to your boyfriend, explain, send him some links about HG pregnancy and what it is. He won't be able to ever really get it unfortunately, but he does need to step up and help you in every little way he can, making you food and drinks as you need, cleaning the house, washing your hair for you if you can't do it yourself! Show him this message. Tell him you need him more than ever. www.babycentre.co.uk/a1018905/hyperemesis-gravidarum-severe-pregnancy-sickness
www.pregnancysicknesssupport.org.uk/what-is-hyperemesis-gravidarum/
Sending hugs and strength to you!