I've an unanticipated day off, due to a flare-up of an old back injury. I tried working through the pain, but found that I'd added a new symptom - a shooting pain down my left leg. Apparently, it's sciatica, an unbelievably painful irritation of a major nerve, caused by spinal problems.
So, I visited the chiropractor, rested, did the whirlpool thing (one of the few good things about this rental), and prepared for another day out. I'll be moving around slightly, in between cautious stretching and LOTS of rest.
Maybe, even, time to post.