My daughter had an episode while at the grocery store years ago and couldn't do math or talk right. Went to the ER and they diagnosed it as migraine. I didn't believe it and insisted she get a follow up. After hours at the hosp the next day they too said migraine. A girl my sister worked with would forget where she lived and how to call when she had her migraines. But 3 days is what makes it so worrisome. Good luck and hopefully you won't have it again. Take care.