Both my PG's I was being sick about every 15-20 mins for about 8 weeks. So not able to keep anything down at all. Both times I was given stemetil (an anti-emetic.) The tablets didn't really have enough time to take effect so they ended up giving me ahem suppositories. At least I wasn't able to throw them up and they did take the edge off eventually.
I wasn't admitted to hospital the first time as my (then) doctor was rubbish. However, second time, when my keytones were through the roof and my blood-pressure in my boots. They admitted me to hospital to be re-hydrated. Some nurses were really sympathetic, some said it was a psychological thing.
I lost over a stone in weight both times, but I did get through it and I did start to feel better. During my second pregnancy I felt overwhelmingly guilty for sitting my (then) 3 yr old in front of the TV for hours at a time whilst I spent days with my head down the loo. He doesn't even remember me being ill now, and so although I felt really bad for putting him through it, he doesn't remember now.
Don't struggle through, go to your Docs. Some are of the view that HG is all in the mind but a good doctor will check your keytones and make sure you're getting what you need.
I hope my story will help others to realise that although its absolutely hideous, there is a light at the end of the tunnel. Eat what you can, drink what you can and rest as much as possible.
This time, as long as I can get through Christmas without wanting to die, that'll be enough for me.
Good luck. xx