After sleeping in the back on hydrocodone, I started feeling better. There was still a little pain, but it was tolerable. But then sitting in this chair at the computer all evening made it hurt again. Mainly, the seat cushion has gone flat and hard. I also wonder now if maybe this desk is too low... (If so, that'll be a real problem, because this desk has a hutch on top and all sorts of stuff on it, and raising or replacing it will be yet another HUUUUGE task.)
So today I purchased an ergonomic chair. It will be delivered either tomorrow or Monday. I'm still sitting in the old chair, but I'm going to see if I can make it more comfortable with a folded towel in the seat. If my back starts backsliding again, I'm going to shut the computer down and not log on again until my new chair arrives.
So... we'll see.