You mentioned Atopica. Have you tried it? It has helped our Zuzu so much. We give her the generic pill form and purchase online from Allivet. I think it costs about $30 a month. It takes a while to see improvement, but when she started her belly was hairless and raw from licking and within 2 weeks her hair was growing back. It has allowed her to have a life rather than spending every waking minute licking and scratching.