I've never had the headaches, burning, or fainting spells... BUT, I have had other symptoms (mainly panic attacks, and anxiety) that come and go whenever they want to. They last from minutes to days. There's no telling when they'll start or stop. I've been on 300mg phenytoin since Oct.'01. Weaned off once then back on. Low amounts of Lorazepam helps sometimes.
I've had a problem with flourescent lights, bright sunlight, and too much computer use. My eyes and head feel funny when around them... kind of light-headed and over tired... even if I'm not tired.
Are you exposed to flourescent lights? Does bright sunlight trigger spells? How about a lot of stress? How about timing of spells with periods? Had any infections ANYWHERE lately?
I have reactive hypoglycemia... sort of the opposite of diabetes. Have your blood sugar levels tested. I used to get dizzy sweaty and weak if I didn't eat enough. (This started long before any signs of having seizures.)
Lastly, how's your blood pressure?

Good Luck!