T.P.
Catamenial epilepsy is 100% hormonal-related. http://professionals.epilepsy.com/page/catamenial_pattern... And while Keppra is made for epileptic seizures, it doesn't address the cause, and I'm not sure the side effects are worth it. http://www.rxlist.com/keppra-drug.htm
Have you had your hormones checked? There is a really good hormone doctor in Austin named Dr. Tenesha Weine http://www.drteneshaweine.com/hormones/saliva.php. Since the CAUSE of your problem is hormonal imbalance, that is where I would recommend you start.