Oh, I'm sooo sorry you and your puppy have to go through this
. I don't have any advise for you necessarily other than maybe look into a second opinion or take him to a veterinary university in your area that will be able to possibly do more for him and if there's something else going on, diagnose it. Hopefully Ellie Mae (I'll send her a PM for you) will see this post an offer some advise (she's in vet school). Good luck, sending prayers your way. You definatly cam eto the right place for support