The latest episode your son has had is suggestive of Pain induced Syncope
. All the features described is fitting with a Syncope including the brief uprolling of eyes and jerks and waking up quickly without much confusion.
The earlier episode while he was playing the Video game is more difficult to comment on as there were no eye witnesses and we are not exactly sure about the duration of the event.(how long he remained unconscious) Even this episode could have been brought on by Pain-the shoulder click.
In Seizures many a times the EEG & MRI
Brain can be Normal. The only worrying thing is the abnormality in the EEG. You could take a second opinion
about the EEG to see if its a significant abnormality. I say this because antiepileptic treatment is longterm and hence we need to be reasonably sure about the diagnosis before medications are started.
What is certain is that your son has tendency to lose consciousness when he encounters pain. He could lie down immediately in such circumstances or flex his legs close to the chest in a sitting position to avoid falls. I think you could wait on starting medications as the evidence is not overhwhelming in favour of a Seizure. Discuss with your doctor regarding precautions you can take to avoid Syncope other than the ones i have mentioned above.
Hope this helps!