It sounds to me as if you're having some spasticity in your back. Mainly what a chiropractor does is just 'crack' your back. They'll give you some bushwa about subluxation, but don't believe it! You're getting relief from stretching those muscles and popping the nitrogen bubbles.
What I would do is seek out a massage therapist, preferably one that does deep tissue massage. It'll hurt like you-know-what, but when they're done, you'll feel much better.