DO. You need a diagnosis and proper evaluation for chronic achiness. A do is trained to do this and supply proper therapy. A chiropractor is using a disproven, outmoded theory to justify what they decide in almost all cases that there exist in all of their patients spinal "subluxations", a bit of nonesense that has never been proven, and that their 'adjustments' will correct this. See the do.
DO. Chiropractic came to its founder in a dream from the spirit world. DO training is based on modern science like MDs but they include more holistic options and some manipulation. This way the can make sure you are not missing a real medical problem underlying the achiness.