I had my lower left last molar removed due to infection about 4 weeks ago. The tooth next to that is hurting extremly bad when I touch it, and my jaw is very sore under my tongue. My lymph node on that side is also in pain and can be felt to the touch. I know that I need to go back for the other tooth, which had a root canal but no crown, a year ago, but why am I not healing from the first extraction? I should also mention that it hurts to swallow and my chin feels full on that side