Hi, and welcome.

If you've had multiple xrays & MRIs that show nothing, I'm wondering on what the chiropractor based his/her statement... but I guess that's neither here nor there.

Sounds like it could also be chronic myofascial pain. My first suggestion would be to find/see a certified myofascial trigger point therapist -- CMTPT (not just a physical therapist or massage therapist who says they know all about trigger points or have taken courses/training). They do not use injections. Even if your insurance won't cover it, it won't break you. If they can help, they can also teach you what you need to know to help yourself from then on.

Doc