Olivecake Welcome. Sorry for your loss. An mmc is bad enough, but with Hyperemesis... You already have had great advice from Bored and Foodylicious about getting stronger meds and kesostix. I gather form the trusty Wickipedia that emesafene is a similar to cyclizine. I hadn't heard it is sold in the UK, though I am hopelessly out of touch about new meds for Hyperemesis! Are you in the Netherlands? I so agree with the others, you will soon be very dehydrated, and do get the magic sticks to check for the early stages of dehydration. A pregnant woman who has been unable to retain liquids for 24 hours should be treated as a medical emergency.
Some liquids that have helped others: - flat full sugar coke, ice cubes, ice lollies, the juice of tinned fruit, soda water, Elderflower Water, lemonade, Lucozade, fizzy orange, orange juice (if you don't have too much acidity) sips of chocolate milkshake (maybe soya), Dr Pepper, and Robinson's fruit drinks. For food, of a sort, nibbles of crisps and chips, Scotch pancakes, cheap ice cream, cuppa soup, baked potatoes, jelly and nibbles of melon and mango.
Great advice, Bored and Foodylicious 