I came down with a sinus infection 4 days ago, that caused alot of nasal congestion, and then a cough developed 2 days later. Yesterday, my very back molar on the right upper side started hurting alot. My whole cheek swelled up and today it is pretty swollen and warm to the touch, all the way down to just above my jawbone. Several years ago I had a root canal done on the 2nd molar next to the one that started hurting yesterday and I occasionally have had minor pain in that area, but nothing like the swelling that I have now. Just wondering if you think it could be an abcess? Could ve it s onset have been due to the sinus infection? It is Saturday and there are no medical or dental clinics open until Monday. I do have a 2 day supply of Augmentin left over in my fridge from a bout of strep that my kids went through a couple of weeks ago. Should I go ahead and take it to get me throught until Monday when I can get into a clinic?