When untreated, a migraine usually lasts from four to 72 hours, but the frequency with which headaches occur varies from person to person. You may have migraines several times a month or much less often. During a migraine, you may experience the following symptoms: Pain on one side or both sides of your headPain that has a pulsating, throbbing quality,Sensitivity to light, sounds and sometimes smellsNausea and vomiting..Blurred vision,Lightheadedness, sometimes followed by fainting...other causes can be cluster headache,infections of brain tissue and meninges etc...consult good neurologist they will help you