I don't think a 13 yr old would make up those types of symptoms.
I'd find a new dr..

Have you considered seeking out an expert chiropractor that also does the upper cervical adjustment? {also called c1,c2 or atlas /axis}??
I found a very good DC in 05 { I took a header off my horse as a teen, and some other hits & falls from cars /sports} and 30+ yrs later I think the minor misalignments played a part in my chronic RSI work injuries.

here is some info to get you started - it might be all that your son needs to get on the mend.

SIGN / SYMPTOM CHECKLIST
http://www.upcspine.com/self.htm
home page -
www.upcspine.com