Suggest A Remedy For Severe Sinus Headache

Ive had really bad sinus headaches for a couple days, then my front 6 bottom teeth started hurting, then my whole mouth hurt. every single tooth. it was immense pain. nothing helped. i cant eat or sleep. i called the dentist asap, and went in, got an xray, and he said i need a root canal on one or maybe 2 front teeth. so i got home and fall asleep (finally) for an hour, wake up, sit up and all the pain from my mouth is gone. my front teeth still hurt, but not as bad, but then under my tongue started swelling,and my chin feels like its on fire. i have a consultation tomorrow at another mouth doctor, but no more of my top or back bottom teeth hurt. what the heck is going on?!