I just went through a 12 session (was going to be 20, more on that later) chiro plan late in 09. My words of wisdom are to visit a couple places before deciding on one. I was to the point I could not get off the floor/couch/bed to walk at all, so I went to the closest and fastest I could find in the phone book.
I didn't believe in them at all but I was desperate.
This place - Ohio Chiropractics oh Heath - or something like that was a joke. Front desk guy who doubled as the phys. therapy guy, massage girl who quit the day I was supposed to get my first massage, back wraps that never came in, over-billing for treatments, etc.
In the end, I am ok now, but my gut tells me I would have healed on my own. Your case sounds more severe.