One of my cats went through the allergy thing a month or two ago. Brought her into the vet because she was constantly itching, meowing and licking. She was obviously not happy. The vet gave her a Depo shot (not the birth control, don't know what the full name is, that is just what she told me) for skin allergies, put her on Science Diet for Sensitive Skin and now she is happy as a kitten. And I know how A LOT of people hate Science Diet, but now that it is helping with her skin and has changed her coat and attitude, I swear by this food! Hope your kitty is back to feeling better soon!