sharp pains that occur on the left of my head then switch to right then back of my head,they last for like 10 seconds at a time but they are sharp it's been going on for a month now,i don't understand why medicine my doc prescribed me is not working i have penicillin and all i dont think it's coming from stress i do have a tooth that needs to be pulled maybe its decayed which could be some of the problem some one please tell me what you think im so scared!