For a while now, I've been having mild pain the the lower left part of my head, just at the base of my skull. It's not constant, and it's not extreme. It's like little pain shocks that come and go. Recently, the same kind of pain started showing up in my left neck. Again, it's not constant and not extremely painful. It comes in a flash and quickly goes. I've recently had a root canal in the last bottom tooth in the back of my mouth. Maybe it has to do with that.
Should I be concerned?