I get terrible ( very severe, like a needle piercing through the skull ) headache , I believe it is after being exposed to sunlight. It is usually behind and around my left ear. And it spreads all the way at the center right behind my head. And even when not out in sunlight, sometimes I do get this similar severe pain, but then it is usually only behind my head at the center spreading to top. And finally it ends right at the center of my forehead . I have no idea about what I should do. Please help me.