[Ellie May]

If it's environmental, then why the food switch? Or is it both?

Was an anti-nausea med tried with Atopica for the first week?
Have antihistamines done any good?

If the vet wants to do an elimination diet, then usually one protein and one carb are used (Natural Balance may have something that could work) or an rx diet with hydrolyzed protein. I don't know of any raw premade diets that use whitefish and I don't think any of the companies would make a raw salmon diet for safety reasons.