Back problems usually have to do with something deeper on the mental/emotional level like: lack of support (lower back) or grief (upper back). The problem is, that trying to address emotional and mental stuff with physical treatments like physio or chiropractic, rarely has lasting effects because the emotional stuff is not addressed but is there ticking away in the subconscious!
My advise is to find a qualified therapist, like a homeopath, who can go into the real reasons why the back hurts: the root cause of the problem and treat that. Then the back problems will disappear.
I treat numerous patients with back problems and the real cause is ALWAYS some emotional issue, even when there was history of accidents or trauma to the back.
I hope this helps.