Backwards seizures? Please read

I am a 22 year old female who had her first Grand Mal seizure at age 16. I am currently on 400 mg. of Zonegran/ day. I have not had a grand mal seizure on over 2 years. The strange thing is that I have what I call backwards seizures. With symptoms starting out and worsening for up to 72 hours before a grand mal. My symptoms start out with me getting groggy and tired feeling, and becoming confused. I will soon not know what day it is, and not be able to write. I will be slow to respond to questions or someone talking to me, if I respond at all. I will become defensive, not wanting to be talked to. I will usually be nauseated and almost always vomit a few hours or minutes leading up to the seizure itself. Sometimes the episode ends in a seizure, sometimes it ends with me sleeping for over 24 hours and waking up feeling much better. I do not have auras, I do not have hand rubbing movements or anything like that. I have had a CT Scan and a Sleep deprived EEG and both came back with nothing. Only one time I felt I had a "normal seizure" where I was mainly fine, until my arm began to involuntarily spasm and suddenly I had a grand mal seizure, all in the span of 10 minutes. Funnier still, when the seizures are over, I will be fine in a matter of minutes. When to my understanding, usually a person has no or few symptoms leading to a seizure and then it takes quite some time to feel better again. Even stranger still is that these at first seemed to have no pattern, no rhyme or reason, and now i have noticed that these episodes happen when i am about to begin menstruation, but not always. I may get them about twice a year. Any ideas?