The advise to seek profesional advise is spot on. I would strongly recommend looking into physical theripists. A good one can be an invaluable resource with back pain. It is also my experience that back pain will keep coming back until you change what ever it is that causes it. A good PT can be the key to getting a handle on this kind of problem. Most MD's will just refer you to a PT so why not just start with a PT?

Also, a "good PT" is not one who sits on the other side of the room and talks about exercise. A "good Pt" will be very hands on about diagnosis and treatment. Keep moving on until you find a good "hands on" therepist, then listen to what they tell you. I appointed my PT the "Responsable Adult" in our relationship, and I have never regreted it. After years of intermittant, dibilitating pain, I have been pain free for a couple of years now.