hi, first of all you didn't mention what is the medication is he on and how was it diagnosed as epilepsy? fever
do not need long term medication and you must consult a neurologist
and to discuss about the need of treatment, if any. Secondly, eptoin
is notorious drug to produce ataxia in the long term and even during short loading dose- let us know whether he is on this drug? While reading between lines, you mentioned a sudden jerk of left leg? is it a myoclonus? I strongly advice to see a neurologist.