J.L.
I am very sorry to hear this. I know this is going to sound strange but have you taken him to a Chiropractor? I work for one. The reason I bring this up is that if it were my child I would want to seek out all options before subjecting him to endless poking-proding and x-rays, etc. It could be as simple as just a nerve that is being pinched off or pressed on by a vertebrae. If you are interested please respond. I work for a great one! hope this helps!
P.S. My son has been adjusted since birth and has never had a shot or drug in his adorable little body.