Chronic,left sided post nasal drip:What caused this and how can I make it stop? Hello. I have dealing with chronic, left sided post nasal drip for over 20 yrs now.This is annoying, causes voice loss, and I have swollen lymph nodes in my left submandibular area. All of this began after I had wisdom teeth extracted, and worsened even more after an upper molar extraction. HOW CAN I MAKE THIS STOP???