A few days ago, I had a terrible toothache. It was on a tooth that already had a root canal done on it. The tissue surrounding the tooth was very swollen, especially on the roof of my mouth. It was on the weekend and I could not stand the pain, so I visited the ER. In the ER, the Dr. gave me a shot to numb the area (just like at the dentist), a rx for anti-biotic and pain pills. The tooth pain went away and was replaced with a severe raw feeling on the roof of my mouth on the side where the toothache was. I also have a canker sore on the inside of my lip and 2 cold sores trying to form on my upper lip. I am in so much pain! Help!