Buster was having itching problems and I went to this holistic pet nutritionist. I have cut out all grains, sugars, tapioca's etc from his food and he is doing much better. Perhaps you could email Marc with your symptoms and he could offer suggestions. You never know. I hope you find a solution. Here is my thread about Buster visit.
http://www.yorkietalk.com/forums/yor...endations.html