I think I may be allergic or sensitive to the local anesthesia used by dentists. Even though he didn’t have to give me very much today and it wore off quickly….. I got the worst headache ever for about an hour as it wore off. Funny thing is…. I felt crummy after he did the original work on my tooth a couple of weeks ago…. but never associated it with the anesthesia! I don’t know what’s worse…. the headache and feeling crummy or feeling the pain!