[QUOTE=Fairfax;6861252]
Pancreatitis. Withdraw all food for 48 hours…just allowing water. It allows the pancreas to start to settle down. You can purchase a fatfree solid and moist food from a vets office. This is the most common cause of ongoing vomiting. Many times the stomach cavity will feel extended and may be painful.
After she has had the two days…start her on one table spoon of the soft…increase it over the next 5 days. Then start to introduce the fat free solid food.[/QUOTE]
Really? In cats? I have never heard that before. And with all the vomiting cats I’ve had, I’ve never, ever had one with pancreatitis. If I had to guess, I’d say the most common cause of vomiting in cats is renal disease, followed by IBD, but that would just be a guess.
I’d advise caution in withholding food from a cat, though, especially one that might not have gotten much nutrition in the past few days because it’s vomiting. Hepatic lipidosis isn’t fun 
My SOP in a vomiting dog is to withhold food, but I would not withhold food for a kitty unless it had been seen by a vet and that was the instruction given.
FWIW for those looking for alternative food options, my IBD cat is doing very nicely on Hound & Gatos rabbit. We have a positive dx of IBD via ultrasound. Treated with steroids and Cerenia, which resolved the diarrhea, but we still had vomiting. Switched to the rabbit and vomiting has resolved completely, and we’ve even been able to stop the Cerenia.