I have had two hyperemesis pregnancies. With my eldest son, I vomited from about 6 weeks to around 13 weeks. I was hospitalised once for rehydration, and had to use stemetil suppositories (tablets wouldn't stay down). I lived off of flat coke. With my second pregnancy, the vomiting started at 6 weeks and continued up until 16 weeks. I was hospitalised twice, came very close to renal failure and as a last ditch effort was given odanestron. Luckily, it stopped it in it's tracks.
I will never, ever forget the sheer hell of being trapped in my own body. The horror of feeling the earth move beneath me, or the horrendous hyper sensitivity to all smells. I remember hating the foetus, despising all the 'blooming' pregnant women around me, and at it's worst just wanted to die. The physical affects of hyperemesis are well documented, but there is precious little help for the psychological affects. I tearfully asked my parents and my DH if they would hate me for terminating DS2. I was about 11 weeks at the time. All I could see in front of me were a long unbroken chain of vomiting episodes. I even threw up in my sleep. In the 24 hours before the odanestron was administered, I was sick every half an hour, even while asleep. I was bringing up blood from the ruptured blood vessels in my throat.
The reason I'm telling you this is because I want you to know I have been where you are, and I know how hopeless it all seems. But (and it is the most huge, enormous, colossal 'but' ever) I did get through it. I now have two boisterous, amazing, funny sons. It was worth every single episode, every bleed, every injection, every dark moment. I am not in any way telling you what to do. All I know is, that when you feel so completely alone, you long to just feel normal again. If you do decide to terminate, I certainly wouldn't blame you. I got through it by not looking ahead, trying to focus on one hour at a time, and not thinking about babies at all. I thought of it as an illness, not pregnancy. That way, when I was better, I could still feel excited about the baby.
Gah, not sure if any of that was helpful, it's just that I read your post as a plea for someone to understand how horrendous it is, and I do.