Goodness, it's been busy! Three new sufferers!
Welcome to user polkadotpolarbear and Haylzt. Sorry you are all suffering. There's been great advice given already.
polkadotpolarbear I so agree with others, do ask for something other than Stemetil as there is a variety of meds and combinations. An anti acid like Omprazole or Ranitidine can really help.
user It might be worth phoning Pregnancy Sickness Support on 024 7638 2020. They will phone you back with good advice on obtaining effective meds. Also, as above, an anti acid is well worth a try.
Haylzt Unfortunately that does happen with some people. Have they tried Ondansetron yet? I think eallison has spoken of how the price of that has come down. Also, as above, an anti acid.
I would also recommend that anyone vomiting more than a couple of times a day needs to get kesotix to check for the early stages of dehydration, though I know ketones are questionable as a sign of dehydration, they do take them seriously in A and E as a sign.
Some liquids tlat have helped many; full sugar coke, ice lollies, ice cubes, the juice of tinned fruit, fizzy water, soda water, Dr Pepper, Lucoazade, Iron Bru, fizzy orange, lemonade, orange squash, orange juice (if not too acid), Robinson's fruit drinks and sips of chocolate milkshake(maybe soya). Foods of a sort include cuppa soup, Scotch pancakes, nibbles of chips and crisps, tinned fruit, slices of melon and mango, baked potatoes and cheap ice cream.
silversplodge How are things?
8DaysAWeek Congratulations on shower. 
eallison Great advice. Are you a teacher, as you mention 'the head' or is that a head of department? I am glad you got sympathetic treatment and no doubt you have got the laxatives to hand!
Sasshemonsta Sorry about the awful nausea.
Waves to all.
Apologies to anyone rudely ignored.