Oh, Blondie.... how hard it is to see our kids go through this!
I went through the whole series of GI stuff some years ago so I can totally relate. So many tests, so many pills, so much money.... nothing worked until I changed my diet. Doctors just won't tell you that.
Hopefully your son can come away with a clean bill of health and give you all some peace.
God bless,
Robinrs