I have this hard lump (it's hard like a bone) between the base of my skull and the top of my neck bone. It's right in the middle. I hurts when I turn my head and it hurts when I lay down. However, when I sit up it's not as bad. The pain is like a kink in my neck, but hurts from one side of the base of my skull to the other side........Does anyone have any idea what this could be, or has anyone else every experienced this?