Yup. I've had 6 diagnosed, four of which I was knocked completely out. The last time I was out for about 20 minutes. I now have severe headaches about 5 days out of seven that typically last about 90 minutes. Nothing they can do for me except drugs, which I refuse to take due to risk of addiction and the stomach problems they create. I will say this: You do not want to live with these headaches.