Awwww hon, it's hard to be a parent. I have to hand you credit. Even harder being a parent when your child has an illness.
I've been thinking.......
What I think I would REALLY do? Keep him on gluten & start looking for a new derm right away. See if you can't get him in before you have to go back to the one you saw yesterday. Hedge your bets. I have to say the derm yesterday doesn't really seem to know his stuff. My gosh! I can't believe that statement about it just being a mild case. And if you take him off gluten then a biopsy can't be done. Where is this doc coming from??????