What kind of docs have you seen and tests have you had done? Unless you have some underlying condition or you are on a medication, like a benzodiazepine (ie Ativan, Xanax) that had run out and you stopped taking abruptly, anxiety itself would not cause a seizure.
Are you taking any medications? Can you elaborate a bit on your history for us?
My roommate suffers from severe anxiety and has had 2 seizure related to that so I can say that I have heard of it. He is on anti-anxiety medicine and he says that unless he runs out early it keeps him from having the seizures.