bacterial infection
"I was prescribed amoxicillin in preparation for my first root canal. The tooth was sensitive, but did not hurt.  They made me exhausted, alternately chilled and sweating.  Lost my appetite.  Can't sleep.  Skin is sensitive to the touch.  I'm seeing halos around bright lights.  Urinating gives 1/4 to  1/2 cup every hour or so, and I couldn't stop the dribble. I might buy some Depends to save my pants."