I had a root canal done about 20yrs ago. It seemingly has a crack in it as I have gone from Dentist to Endo to Peri specialist. It has really flared up about 3months ago. Lot of pain, have had a pocket next to the tooth. It is the lower back left ...back tooth. I have been on a antibiotic for about 10 days , still pain of course and still on antibiotic before they will extract the tooth in about 5 days.My question is , I am having pain in the upper left sinus area above my upper teeth. Can the pain radiate that way and also, I feel more tired than usual and seem a little depressed...does this have anything to do with an infected tooth? I am so hoping to feel a lot better after the oral surgeon gets this thing out. Can I get up the next day and go on with life as usual?