Your story sounds a bit familiar, but different:
I had surgery 6 months ago, everything went fine . Post op visits were great too. Did my rehab vigorously and still do , but my back was bugging me off and on for the last 2 months +.2 weeks ago I went to see a chiroprator and was lying on the floor within an hour with very serious back pain. I even took Oxycodone at 3 a.m. that night. It took 1 hour to kick in somewhat (mind you , I was off that stuff 3 days post op). I took various approaches since, acpuncture, massage . Nothing really worked. I saw a holistic/ somatic practioner and she told me that my body needs to relearn how to move normally and stop `proceting `. So I ramped up my streching and it seems that I get better ever so slowly.
This is what I fly by:
Observe your body. Figure out how you move. Where are you not in balance? Try to gently stretch and improve and take things in small steps. Learn when to push and when to rest. Callenge yourself . Or rest. It is your pace you need to find. Find help , if possible, but remember that nobody lives in your body but you, so ,again, you have to learn when to take advice and when to refuse it.
Good luck.