How Can A Swollen Lymph Node On The Right Side Of The Neck Be Treated?

Hi I have a very swollen lymph node on the right side of neck close to in crevice of neck and chin.. it is tender.. size of large grape.. I have no fever.. body aches .. i had 2 root canals about 2 to 3 weeks ago.. then a sore throat following which healed but I recently experienced drainage in back of throat no coughs or anything. but Sunday I woke up with very swollen lymph node and sore.. it went down by Monday but still there and sore.. today it is back larger and still sore... how should I proceed