I'm baffled--can't figure out if I got injured working dish or have a tooth problem

[knuckler]

Well, not only am I an umpire, but I am a dentist as well. Seeing how your swelling was almost a month ago, hopefully you have got to the bottom of it by now. I would highly recommend having the endodontist evaluate it, even if the Amox did the trick. It is not uncommon for a tooth like you described to respond to the antibiotics, but if it is a failing Root canal, it will eventually rear its ugly head again, usually at the most inopportune time!