I'm a healthy individual with no history of headaches/migraines ever. Lately, I've been suffering from sharp, acute pains in my skull. There's an intense and blinding throb for a second or two and just fades away for a while. It happens on the back of the skull (left side), and the pain travels along till the top. There's not regularity in these incidences and they strike any moment without notice. Happens 3-5 times a day.