Mmmm, drugs
I had to relent and go to the doctor today about my back. It was getting slightly better each day, but this progress stopped some time ago. He prodded and pulled me about a bit, asked some horrible questions (if any of my components were malfunctioning in the ways he described I'd have gone to A&E), and finally decided my back is actually healed, but the nerves need stretching. He gave me some tablets and exercises, and so far it's really good - no pain whatsoever right now. I could go out in the garage and get busy on that car right now... but I won't, of course.