It sounds like the doc at the concussion clinic uses the SCAT or other questionaire. To me, that concussion clinic has very limited expertise in concussion. It is very problematic to use a self-reporting questionaire for someone as young as your son.

Has he been tried with any anti-seizure meds? Just because he did not have a positive EEG does not mean he would not benefit from an anti-seizure med. The 24 hr EEG may not have been long enough for the episode to repeat.

Hope this helps.

My best to you.