Hi Becky,
Yes, a Migraine can trigger a Migraine-triggered seizure but it is pretty rare. We have this Ask the Clinician question Can a migraine cause a seizure in a person that does not have epilepsy, you may find helpful.
Hypertension is a risk factor or stroke, although I don't know about seizures. We have some information on high blood pressure and Migraines HERE.
Good luck
Nancy
Important:
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of The HealthCentral Network. The HealthCentral Network does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.