Did you get drugs to take home with you or were you only given IV anti-emetic drugs in hospital ?
I was v sick with first pg and discharged from a 3 days in hospital with tablets. They worked reasonably well.
Second pregnancy I asked for the same drugs as soon as the vomitting started but they didn't work for me that time so I ended up in hospital for 4 days and was discharged with MUCH stronger anti-emetics which worked well for me.
You need to take control of the situation yourself, I managed to keep working except for the short time in hospital, but you need to demand treatment and not be afraid to take drugs that have not been tested on pregnant women (i.e. cause the GP and pharmacist to worry about prescribing them)
There are so many myths truly believed by people who have never had HG themselves.
Lets bust those myths:-
It does appear to be hereditary - My mum and her mum both had hyperemesis in all their pregnancies so I'd second whoever said it is hereditary and you are more than likely to suffer it again. Thankfully I've just got boys so I haven't passed the curse on to a daughter.
You can be sick on an empty stomach- it tastes foul and hurts and it's not good for you.
It isn't all in the mind - I bloody well wanted to be able to go to work each day and look after ds1 without asking for help. I certainly had no subconscious desire to be "looked after" in hospital whilst my mum/MIL interfered with the running of my home and my career went down the pan.
All ginger and arrowroot do is make things taste a bit more pleasant on the way back up !
When you say you can't keep anything down, that's exactly what you mean, even water comes back up so dioralyte isn't gonna work !
You are ill, not just pregnant ! (thanks MIL for giving your ds the impression that his dw was being a lazy cow, hoping for an easy time by exaggerating how crap she was actually feeling).