Never tried chiro. I was carried into a sports physio's practice in 1998, and managed to walk out under my own steam after 20 minutes treatment, which was a miracle as far as I was concerned. I had three further sessions, including an RF bone heating treatment which included the direst warnings I've ever seen outside of laser operation.
His take on my injury was that I needed to do a number of specific exercises to maintain joint stability, and when I asked "how often, and for how long?" He said "Every day. For ever," so that I understood.
It sounds like an imposition, but as long as I maintain the regime of at least some form of those exercises (best variation so far has been aikido), and if not 'daily' at least 'regularly,' then I need no further treatment. The muscles help support the skeleton, and if you look after them, they look after it. I haven't needed treatment since.
I don't have any idea what Mrs Z has done to her back, and unless you get a real diagnosis, neither does she. Backs are a bugger when they're damaged. Mine happens to respond very well to good old fashioned exercise, as do many others. My take would be to get a real diagnosis if you haven't already, and if it responds to exercise find someone who will give you the tools to fix it yourself and actually do the bloody exercises. The number of people who think they're fixed, and then carry on with the same stupid behavior as before are astonishing. Including me.