That other poster would be me. I too no longer take medication after taking it for a few years. I no longer have seizures.
You may want to have your son tested. Temporal lobe epilepsy which generally take the form of partial seizures run in my family.
And, regardless of what the EEG says, you may want to try your son on a good anticonvulsant mood stabilizer (not lithium, it lowers the seizure threshold).