I suffered really badly with sickness in both pregnancies. I didn't know that what I had was called Hyperemisis for quite a while, so I didn't know to read up on this for help. This is why I have just called this thread "Pregnancy Sickness".
I know Lucinda has a thread called Hyperemis Support, which I found really helpful last year, but there is also this organisation Pregnancy Sickness Support I didn't discover this charity until I was feeling a bit better with my second (and last!) baby, but I have done a bit of voluntary work for them since. They may be able to help you, and the website is really useful.