One thing we learned when my mother-out-law (my bf's mom) was going through her final couple of years is that medical pain control is still really primitive and inadequate. Still, it's worth your while to get as aggressive as possible (in a very civilized way, of course) with your family doc and any relevant specialists you can get to. With good health care, and sometimes physiotherapy if you need it, this sort of thing can be brought under control. If your leg pain is sciatica (the result of a pinched spinal nerve), chiropractors can work wonders too -- i got rid of a ridiculously bothersome leg pain that way.

If you need health care that you can't afford, get out there and support Pres. Obama NOW (assuming you're American).