When I was twelve I was incorrectly diagnosed by GP as having one leg shorter. When I was 25 I reckoned I would be in a wheelchair by 30. Then my auntie from Australia came to visit and told me about what a chiropractor is, what he can do for you and one good one not too far from my home.
That auntie/chiropractor saved my life. I am 50 today and able to do anything I darn well please, a lot more, actually, than most people around me my age.
I suppose, like in every profession, there are good and less good one's. I am cheering for chiropractors, obviously.
BTW, did you know that stomach problems, including intestinal problems, can make you have upper back pain and/or headaches?