Can migraines and high blood pressure cause a seizure?
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.