Welcome back to MyBabyBoyBlue and Surprised 2020.
Sorry about the admissions and weight loss. I hope they find a regime of meds that help. Try not to worry about the lack of vitamins. Many sufferers can't keep them down, especially iron, and especially in the first tri. Unluckily, ten weeks can be round the worst stage; even with normal pregnancy sickness, it often seems to go on until week 14, and Hyperemesis can linger longer. 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.
FunkyPolar I do hope you are well enough to return, Mother Hen fusses? If you are, that is so good and I am glad you've got a staggered return.