The x-ray showed no abscess. What it did show was that the root of that particular tooth is protruding ever so slightly into my sinus cavity, and from the trip earlier this week, I had suspected that I was getting a sinus infection.
So a prescription for amoxicillin and vicodin later, no root canal, and if I'm not better by Monday, I get to go see a specialist.
Vicodin is my friend.