I have had 3 separate episodes each lasting no more than 20-30 minutes in which I have a stabbing pain in my right temple and the blood vessel there is visibly enlarged and throbbing. I had numbness in my legs, feet and hands before, during and after the occurences. My blood pressure has elevated to 153/103 - 143-95 during and for hours after the incidences. I have hereditary stress-induced migraines. I take Klonopin and Maxalt to control these and I also receive botox treatments for migraines every two months for the migraines. I do experience auras with my migraines and they are nothing like what I experienced during these incidences. My neurologist ordered an MRI and MRA without contrast because his initial suspicion was that I may be having TIAs. Both came back showing no damage. He says it is still posiible that what I experienced were TIAs and wants me to begin an aspirin regimen and return in 2 months for another MRI and MRA to ensure these were not precursors to an aneurysm. Is it possible for me to have had 3 TIAs so small that they would not have shown any signs of them on the MRI and MRA and what could have caused them. Or what else may it be?