Looking For Some Guidance To Help My 15yr Old Son,

looking for some guidance to help my 15yr old son, who. has gone thru so much this past year: had a staph infection, started as a pimple at the hairline by his tempe, 3 rounds of antibiotics & a lot of run-around, we finally found a plastic surgeon who prescribed an antibiotic cream which cleared up the infection. Antibiotics caused havoc on his digestive system...he has lost 50lbs in the last 9months, has been hospitalized, this past Feb for hyper-tension supposedly caused by pain from kidney stones, then went thru the kidney stone blasting in April & now in May we found bumps in his neck & in the collar bone.....what the heck could be going on? I'm looking to educate myself to help my son....can anyone offer some insight?