I went to the doctor (not about that specifically, but mentioned it) and she said it was probably musculoskeletal, but didn't give me any recommendations besides heavy doses of ibuprofen and moist heat.
So: has anyone else had experience with something like this? Would exercise help? Can anyone refer me to anything that would? I know there are a lot of self-help back pain materials out there, but since this isn't the acute back pain that drives people to chiropractors and PTs, I've been unsure whether the standard exercises would help.