I have had back trouble too, but I know what caused mine; my first and only attempt at barrel racing! Two years ago!
anyway, I would go see the Chiro and see what they say. Sometimes, oftentimes, pain inthe back is really originating in the neck or hips. you may need some real adjustments.
Then, I would work on some real strenght building for you abs and core and especially your gluteal muscles. I didn't realize this, but our pelvis is the foundationf for all the other bones; all the others torque off it. If it is out of alignment everything else will be. AND, our gluteal muscles are WAY more important for correct pelvic alingnment than we realize.
So, try this one excersize for now;
Stand nice and straight, pull up your pelvic floor (the muscles that run under and support all your "guts"), kind of like pulling in your stomach, but less severe and more of a sucking UP. not too tense, just engaged.
Stand with your feet just shoulder width abpart and pointing straight forward.
Now, usind ONLY your gluteal muscle, squeeze your buttocks together and hold for at least 30 seconds. Repeat 10 times. do three sets.
Do this anytime you think of it, while braiding, while in the check out line, while wasing dishes. ALSO, do the same thing , same set up but turn your toes out about 30 degrees. This will engage slightly different gluteal muscles.
You will actually feel your femur rotate outward with each contration.
this is not going to cure your back trouble, but may help stabilize your pelvis.