My Daughter Has A Past History Of Seizures, Today At

My daughter has a past history of seizures, today at the dentist he removed her tooth and afterward she fainted for a good minute. She showed a sign of when she used to have seizures by going off into a blank stare. After she came out of it she says she could not hear anything and that everything went blurry then black..now it has been over an hour and she is still very nauseous and appears to be weak..should I be concerned or is this fairly normal after fainting?