Anytime someone calls chiropractic quackery I disregard anything else they say, I have not had the need to see one in many years but at one time chiropractic was the only thing keeping me able to function. Modern medicine is amazing for trauma care but allopathic medicine is practically useless and often produces NEGATIVE results in treating chronic conditions. I have solved far more or my own problems with over the counter remedies or simple diet and exercise modification than were ever solved by prescription medicine. In fact the only prescriptions that I can think of that ever helped me were antibiotics and I have not needed them recently. There seems to be a real con job of enormous proportions going on to try to get every single American to use at least one and preferably more chronic medicines for things like blood pressure, blood sugar and cholesterol and many people are actually being made sicker or even killed by prescriptions.
Correcting my bad posture was the source of many problems I had with weakness in my limbs. Again, visiting the MDs did nothing to help my problems. Not one of three or four MDs I saw at two different hospitals mentioned anything about my posture causing my problems. They basically did the minimal examinations possible (stuck a lot of needles in me) and said I had no problems... and get out in so many words. The chiropractor noticed my bad posture almost immediately and strongly urged me to correct it.
My conclusion....if you've got a serious heart condition, cancer, or some other serious medical problem, medical doctors are for those things. If you've got some sort of chronic condition/disorder, you might be better off seeing an alternative medicine practitioner. The latter have helped me enormously.