moonkid It is definitely worth a try; I would have thought the ketones would be building up. If you have dry skin and mouth, a headache, 'builder's tea urine' or feel vague and dizzy, they are all signs. As others say, hopefully they won't rely entirely on ketones. Remind me the meds you are on? calmercomber and Hairigician are both expecting twins. A lot suffer from that - I got to the point of removing my knickers as I began (when inside) 
cattaxi It does seem to be starting horribly early, and pre-emptive meds are surely the best course if possible. The earlier you start meds, the less chance of the repetitive vomiting pattern setting in, it seems, a neurologial reflex I don't have the medical background to analyse.
DeadDoorPost The taste is awful. Many find sucking boiled sweets, parma violets or some such, can help, but can increase saliva. I used to suck barley sugar from an old fashioned sweet shop. SeaEagleFeather got them online.
TeddyreddyI've added you.
Foreverblues Poor you. That sounds awful. It can't be helped if you are off work. What a time you have had!
On fluids that have helped others; full sugar flat coke, ice lollies, the juice of tinned fruit, Lucozade, Dr Pepper, Iron Bru, fizzy water, Elderflower water, Elderflower cordial and tonic water, lemonade, fizzy orange, tonic water, orange juice, Robinson's fruit drinks, orange squash (if not too acid), and sips of chocolate milkshake. Some foods: cuppa soup, tinned fruit, slices of melon and mango, nibbles of crisps and chips, Scotch pancakes, baked potatoes, biscuits, cheap ice cream and jelly.
Apologies to anyone rudely overlooked.
Apologies to any