Medicine for back pain?

I can't really help you with the drugs but you should try seeing a chiropractor. Most of them are greedy pieces of crap (almost as bad as my dentist) but if you can find a good one they work wonders! I used to have back trouble as well but my chiropractor fixed me up in a couple of weeks. Now I just go once a month for tune-ups because I play a lot of contact sports. Give it a try. You'll feel better.