nubbie Welcome. Sorry you are suffeirng. Are you on meds? I'm assuming so, if you've been admitted for fluids twice. Here's my normal spiel, though you have already had great advice from kalidasa and Melleebacca. Most sufferers find that they improve a lot at some point between weeks 14 and 20, or sometimes later. 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. Also, pink lemonade , cloudy lemonade and Sprite. Foods of a sort include tinned fruit, cuppa soup, nibbles of crisps and chips, cheap ice cream, Scotch pancakes, bagels and biscuits, potato smileys, slices of melon and mango. Protein drinks have also been mentioned.
FateHasRedisignedMost I shall enjoy welcoming you to the fabled Pink Castle after the awful Snakes and Ladders Hyperemesis. 
That's so reassuring for those who have suffered previous miscarriages about that drop to 2 per cent after a heartbeat has been detected: I wish I'd known it myself, and I wouldn't have worried throughout after that first miscarriage.
Derbee That's good news! 
kalidasa Great advice as ever. Sorry about disappointing sickness. Would you be safe to travel to an Acupunture appointment now? They might fit you in as an emergency, if you're rapidly going downhill.
Apologies to anyone rudely overlooked.