Someone I know died recently due to trusting a chiro to handle a serious chronic pain problem. She had undiagnosed breast cancer. Here's a great little piece on the history & theoretical basis of chiropractic. And here's one how chiros have attempted to use libel law to attempt to stifle scientific criticism in the UK.

Everything you said in your last post reminded me of my ex-gf, who developed arthritis in her early 20s and has joints that constantly dislocate - her diagnosis is Hypermobility Syndrome.