my son is 12...a very fast growing boy...plays lots of sports. been complaining recently of dizzy spells during or just after sporting events...he says like he was actually spinning around. a headache with it and a bit of nausea ...but they pass within a half hour with no treatment ...maybe just some water. any ideas? should I take him for a check up with his pediatrician? it s happened twice within 14 days or so...