Are you a woman? If you are, than you should pay attention if this migraine occurs in relation to your menstrual cycle (especially two-three days after the onset of menses).
You may read more about it here:
http://www.nlm.nih.gov/medlineplus/migraine.html There are several treatments for migraine. Anyway, they require prescription, so you may want to consult your doctor (e.g. neurologist) about your migraine.