Swollen gums in back of mouth?

Behind my last molar my gums are like 3 times the normal size. It's hard to bite down and it's gotten worse everyday. I've tried to keep my tongue away from it but it feels weird. I also have been using orajel but it's not helping with the pain. I know there's no food stuck in it I've already tried flossing and it isn't helping. Suggestions?