Welcome to HCM,
After going through your history,you have suffered seizure disorder
in past for which you were adequately treated,hope you are not taking any drug for seizure at present.
You have allergy
itching lesions most likely Urticaria
which is often Idiopathic which cause is unknown.
You can get serum IGE level CBC( Complete blood count
) and allergy testing for various known allergens.
If specific is detected it can be avoided and can cure of itching problem.
Treatment is by anti histaminics like levocetrazine which you are taking.
Please see good Dermatologist
and take treatment.
There are some drugs which can be given in such case but many times condition goes in remission by it self.
Other wise symptomatic treatment has to be done.
Please take care