I forgot to report how I was feeling today.
Yesterday, my back started to hurt again.
I got a good night's rest and I switched chairs at work, and I went jogging today for the second day in a row...and so far it's not giving me that sharp pain. I think part of the reason is the shape of my arms on top of my desk typing away at the keyboard pulls at just the wrong place on my back to aggravate this. I don't know.