Poor Montana, poor little boy--I'm so very sorry he's in so much pain (and of course so are you, seeing him so sad).

I don't have much to offer but good thoughts--but I do wonder if possibly your pediatrician might help? I'm just thinking that sometimes it is nice to have an "authority" figure on your side (as in being able to say to the school if they call, "yes, he's not been feeling well, and our pediatrician agreed that he needed a few days of complete rest," or some such thing).

take good care--
minnie