Zofran is great but chances are you'll need a referral to an Obstetrician to get it, and probably a period as an in patient (expensive drug sadly).
Ok- have a look at the blooming awful website, i will get you a link in the minute. You will see some experiences on there, and also a drugs section, and a self help section. All these contain lots of usefula dvice, although I am not sure the contact us apge works anymore- however I was one of the contacts so feel free to CAT me at any time (have had HG 4 pissing times now, even if something )God forbid) happened to this pregnancy I swear I could never do it again).
Stemetil is but one of an arsenal of drugs, and many people need to try a few to get the one for them. for example, I was on bucastem which is an oral version of stemetil- made me worse if anything, however avomine was fantastic for me- worked for all 4, although with ds1 I neded intravenous meds first to stabilise.
The good nrews is it could vanish literally any time. The bad is it might not. Nobody knows what causes HG and thats because there probably isn't a single cause- which makes it ahrd to rpedict.
heres that link- takes yu to meds page but you should be able to navigate site from there
And if you need a chat / cry whatever- just yell