I have personally been involved with a woman who was almost killed by a chiropractor. The guy cracked her neck, did damage to the underlying veins, which caused a blot clot and a brain-stem stroke. She lost the ability to balance, loss of heat/cold detection, slightly droopy side of her face, and more. It nearly ruined her life and though she won a settlement, it was far lower than you'd think it'd be for such a huge loss of functionality.

This of course is just anecdotal evidence, but it's 100% true (I'm not an anonymous dude on the Internet, this is my name, and I stand by my words). Do yourself a favor and stay as far away from chiropractors as you can. They're not doctors and what they do can have serious consequences.