My cat was throwing up a lot for about 4 days, and I took her to the vet, the 2nd day she had done it... she's about 5 months old, has 3 healthy brothers, they screened her for feline leukemia and something else I cant remember. Both were negative, they gave me Amoxyicilin (sp) and Nutrical to give to her. I have been, and she still vomited for 2 more days, but wouldn't eat anything. I had to put the nutrical on her paws for her to take it, and the medicine was a chore/still is... to give to her. She still continues not to eat, but instead she'll lick a little bit of gravy   off the cat food and then drink a little bit of water later. I worry about her sincerely, and I don't know what else to do. She was weighed in at the vet with 4.5 lbs. And I think shes lost a lot of weight since then. I pick her up and can feel every one of her little vertebrae. Any help would be greatly appreciated. Thank you.