Node under jaw still swollen after 2 years?

Had an infected tooth, had it removed. Had a very swollen node under my jaw in the middle between the chin and back jaw. Took antibiotics went down to the size of a pea but after 2 years its still there. Its moveable and only hurts if I play with it.What can this be? Can taking zithromax help? Yes I am going back to Dr on Thursday.