http://www.aspca.org/Pet-care/ask-th...-for-cats.aspx
You made sure your is drinking enough water if it is vomiting a lot. I been told by a few vets not to feed a pet food for the rest of the day if it vomit up it food and to feed it a small amount of food the next . If the pet keep the food down for a few hours it can have a little more. If the pet is vomiting for a few days is really should be taken to the vet .