Welcome to Daisychainsandsunshine. There is lots of support on here. Sorry you are suffering badly. You've already had great advice from abbs1. Might the hospital or GP add or substitute any meds? The first tri is usually the worst for almost everybody. I
include my normal spiel which I hope will help. Most sufferers find that they improve a lot at some point between weeks 14 and 20. Even those who are unlucky enough to suffer throughout generally are not as ill later on as they are in the first part. A good anti acid can make a surprising difference to the sickness. Kesostix are worth buying online or from a chemists, as while they aren't they best test of dehydration, hospitals take them seriously. When reporting on the vomiting to doctors, remember to emphasize the number of heaves in each vomiting session, as doctors tend to count these as 'vomits' and this can lead to their underestimating the severity of your symptoms. Besides drinking through a straw, here are some drinks that have helped others: full sugar flat coke (if you don't find it too acid), ice lollies, the juice of tinned fruit, Lucozade, apple juice, Ribina, Dr Pepper, soda water, Elderflower water, tonic water, ice cubes, Iron Bru, lemonade, lemon squash, orange squash, orange juice (if not too acid), fizzy orange, 7Up, isotonic drinks, sips of chocolate milkshake (maybe soya), fizzy water, apple juice, Robinson's fruit drinks, Rubicon sparkling mango drink , raspberry Lucozade sport and frozen ice cubes of flat Lucozade sport . Foods of a sort include tinned fruit, cuppa soup, nibbles of crisps and chips, cheap ice cream, Scotch pancakes, bagels and biscuits and slices of melon and mango.
Aranciata Thank you! I'd never heard of tinned apples either, but they might well be just the thing.
hghusband Thank you so much for your encouraging message. I am so glad that this therad helped your wife and congratuations on your baby girl. 
abbs1 Excellent advice, as ever. I can't improve on it.
LittlemissCa I had that feeling as if my throat was swollen, that often comes with the feeling of imminent retching but which hung about - horrible. Also, disgustingly, I often had phlegm which seemed to be trapped at the back of the throat.
Apologies to anyone rudely overlooked.