thank you for your query.
what your son is suffering from is called post concussion syndrome
, also known as postconcussive syndrome or PCS,also called shell shock is a set of symptoms that may continue for weeks, months, or occasionally a year or more after a concussion.it usually occurs in 50-80% of brain injuries.
it includes headaches
,mood swings etc
the prognosis of PCS is excellent.For most people, post-concussion symptoms go away within a few days to several weeks after the original injury occurs.In others, symptoms may remain for three to six months.but usually they completely resolve within the said period.
you can contact me for further queries.