Welcome to Nic165 You have had great advice already,and I can only add my normal spiel really. As Pastnowfuture says, a staggered return is the best idea after a bit more time off. Don't rush back only to have to go off again. I am not sure what meds that you are on, but I am glad that they have stopped the vomiting at least. Here is the normal spiel.
Don't despair,most people get relief between weeks 14 and 21. Even the unlucky minority who suffer throughout almost never feel as ill later on as they do in the early weeks. I have put some generic advice below for both in case it helps.
A good anti-acid can make a big difference. Try not to fret too much about the baby, they are effective parasites and tend to take all the nourishment, which is one of the reasons you feel so bad. So long as you can keep reasonably hydrated, they are unlikely to suffer. Some drinks and foods of a sort that have helped others: flat full sugar coke, ice lollies, the juice of tinned fruit, Lucozade, fizzy water, Elderflower water, Robinson's fruit drinks, fizzy orange, lemonade, Dr Pepper, Elderflower coridal and tonic water (eallison's tipple), 7Up, Iron Bru, soda water, ice cubes, chocolate milkshakes (maybe soya), cocoanut milk, orange squash and sips of orange juice if not too acid. Some foods of a sort: nibbles of chips and crisps, baked potatoes, cuppa soup, cheap ice cream, tinned fruit, slices of melon and mango, Scotch pancakes and biscuits. It might be worth investing in some kesostix if you don't have them already as while they are not the best test of dehydration, hospitals do take them seriously. Otherwise, watch out for inelestic skin, ie skin that doesn't spring back when pulled, dark urine, headache, etc.
GinnyOz You are very brave. Melleebacca is another veteran going for it for the third time. Some people who have suffered before do find they don't get it so badly or that if it is as bad, they understand about the need for early medication, the need not to try and battle on etc that helps. Carrots and apple is very healthy; so many sufferers find that they can't eat much vegetables - some swear by melon and some by mango for fruit and tinned fruit is a favourite. I am sure you are going to ask for Ondansetron again, and the sooner you get meds the better as there seems to be a connection between how ill you become and a pyysiological mechanism in the brain set off by repeated vomiting.
Melleebacca A good rule, that.
Pastnowfuture That is so true about easing into working again.