Im having spasms in my face, i blackout, losebalance and my teeth crack together then i get a migraine.wat could cause this? i do have a history seizr

Seizure / migraine: You have symptoms that warrant medical evaluation. With a good history and physical examination, and with the aid of tests like electroencephalogram and mri, your physician will be able to establish a diagnosis and correct treatment. I suggests a neurological evaluation as well. This could all be related to your seizure disorder. Migraines can co-exist in seizure disorders as well.

Neurological issues: Please see a neurologist asap. Once you determine the cause, treating the dental issues will have to come after that.