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Juvenile Myoclonic Epilepsy
is a type of seizure that is mainly characterized by Sudden onset jerky movements of extremities. The twitching movements you are having in thighs or elbows might be due to the electrical activity in these area. So don't be anxious as in Amyotropihic Lateral Sclerosis
although sudden onset fasciculations are seen, but weakness of limb and atrophy
is main presenting feature, fasciculations are observed but in latter course. Other symptoms like difficulty in walking, holding things are seen more often.
As you have mentioned that you are having just twitching movements and I assume that there is no weakness or atrophy, there is very less chances of ALS.
, it may occur due to seizure itself, due to anti epileptic drugs.
so if you have still any doubt then visit a good neurologist
for expert opinion.