Thank you, Sarah. I will take your advice and be more diligent to figure this out. I will try the sensitive stomach food, but I worry about buying expensive food that I end up throwing out because my girl cat won't eat it. She will starve herself rather than eat something she does not approve of. And I am not averse to working with the vet some more if I need to, I just can't afford that kind of vet bill every few weeks while we try to figure it out. It is frustrating and I do get tired of it, but I love my cats and want to do what's best for them.

Thanks for your comments.