I read the message boards on vin.com - since I work at a clinic I have access to the vets' boards. I usually read the ones regarding nutrition. A couple of vets have used Evo for cats with diarrhea because it is very digestible. I wonder if this would help your cat's vomiting. Im talking about the 95% formulas that Evo makes. Just a suggestion in terms of food.
Oops I just read sugarcatmom's post more carefully and she did suggest Evo. Sorry.
Give a dog food and make him prosperous, he will not bite you. That is the principal difference between a dog and man. (Mark Twain)