Is it Epilepsy or is it not

Hi Everyone,
I am a 49 year old female who out of the blue has had two seizures. One on Feb 14th, one on Feb 23. After 3 days in hospital after the second one, placed on Dilantin, now 500 mg per day, and have had no further seizures. I am having a difficult time accepting that something else did not trigger this, although as yet they have found nothing - apparently typical. Neuro says more than one seizure is the definition of Epilepsy? I would appreciate your feedback. I am having what I guess are all the normal anxieties of a newbie with this disorder. Thanks