I have headache since last 6-8 months. no specific location . sometimes on left side sometimes on right side , sometimes behind. Its like sometime I feel that I have been hit on the head, sometimes i feel pain like someone is pulling my hairs , sometimes i feel pain inside head ( on left side and right side, someone is pressing against). My pain stays for one- two minute max and its not much intensity. and it happens throughout day anytime (say 4-5 times in a day)