SFA21 Welcome. It does indeed get much better for almost eveyone. You are probably going through the worst bit. Hyperemesis does typically last a bit longer than normal pregnancy sickness, which in fact, often goes on to longer than the textbook 12 weeks anyway. This level of sickness is not normal. It is good that you can, though. Are you on any anti sickness meds? Do ask for some if not. There are a number that are safe in pregnancy. There is lots of support on here.
Here's my usual spiel: 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. 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.
RockinRobinn Sorry that the nausea has kicked in badly! For the awful taste in the mouth, I used to suck barley sugar, which I got from an old fashioned sweet shop, but which I think can be bought online.
Parma Violets and Travel Sweets (I don't know if they still do those: I used to buy them at a chemists) are other options.
Mother Hen waves a wing to all.