I am sorry I'm of no help at all.. but I just wanted to say I empathize with everything you're going through - when I read your post the feeling of helplessness comes back to me. I went through something similar exactly last year but my golden had hookworms - so at least he had a diagnosis and I felt immediately better. I really hope the specialists can figure out what's wrong with your golden and all the best to him and also you.. I really hope everything is going to be resolved for your golden, he's a beautiful boy.. please keep us updated.