the only way you can know for sure is to see your doctor immediately. you don't want to mess around with your health especially by waiting. if your doctor isn't available go to the emergency room. you'll gain peace of mind by knowing once and for all. yes what you think is a migraine could very well be more serious - cancer pinched nerves aneurysm etc. please get checked by a doctor.
could migraines indicate something more serious? . see. <link>