JAR FCL 3, appendix 11 is fairly clear on this topic:
3 Epileptiform paroxysmal EEG abnormalities and focal slow waves normally are disqualifying. Further evaluation shall be carried out by the AMS.
4 A diagnosis of epilepsy is disqualifying, unless there is unequivocal evidence of a syndrome of benign childhood epilepsy associated with a very low risk of recurrence, and unless the applicant has been free of recurrence and off treatment for more than 10 years. One or more convulsive episodes after the age of 5 are disqualifying. However, in case of an acute symptomatic seizure, which is considered to have a very low risk of recurrence by a consultant neurologist acceptable to the AMS, a fit assessment may be considered by the AMS.
5 An applicant having had a single afebrile epileptiform seizure which has not recurred after at least 10 years while off treatment, and where there is no evidence of continuing predisposition to epilepsy, may be assessed as fit if the risk of a further seizure is considered to be within the limits acceptable to the AMS.
For a Class 1 fit assessment a multi-pilot (Class 1 ‘OML’) limitation shall be applied.
So, with the initial question of multiple seizures, stabilized by medication, regaining a class 1 would not be in line with the guidance.