Lamictal and dopey

I have just recently started taking Lamictal for my epilepsy. I am weaning off the drug phenytek. I am on 100 mg a day of Lamcital and next week that will increase to 200mg a day. Since I have started the Lamictal, my period has come two weeks early, I feel tired all the time and I feel dopey. I will be sitting in a room of people and they are all talking, but it's as if I am not actually present with them. I am nauseous alot and have terrible headaches particulary in the evening. My emotions seem to be eradic. I just don't feel myself.