I've a knackered back after an incident with a bass cab over 20 years ago (bloody HH 2x15s!)
The only thing that has helped (and I used to train a lot way back when) has been osteopathy. Within a day of it orginally happening I saw an osteopath who managed to get it all working ok in half an hour, and the pain went completely in a couple more. Brilliant!
I still see an osteopath these days, but largely because I live the vegetative life of a programmer in the day, and he keeps me mobile.
Before seeing him (over five years ago now) I would slowly but surely lock up tight as a drum, to the point of struggling to breathe, over a period of some weeks. GPs were useless and just said take pain killers, which neither killed the pain of the condition, nor lead to any easing of the muscular spasm causing it. This would usually alleviate over a couple more weeks, eventually allowing me to move freely for awhile before the cycle repeated. One day it just got so bad that I looked up the original osteopath and asked her to recommend someone, she now teaches osteopathy and had no problems suggesting a local practitioner she knew was dead good.
40 minutes with this chap sorted me out, and to begin with I saw hime every week, then every couple of weeks, then every month, working away at the various issues, and giving me great advice about how I should change my working slouch into something slightly less debilitating etc etc.
I know see him every few months or if I cause myself an issue (haven't for a very long time now, touch wood). This works brilliantly for me, and I'm not about to stop!