I had chronic pain for 10 months after TKR. It took five different medical pros to get the right diagnosis. I wasn't as severe as you describe. You must be terrified. My issue is urned out to be IT band syndrome plus knee and hip bursitis. Those conditions responded to sonar shockwave therapy. Try doctors from different specialties that deal with spine, hips, knees, muscles, and/or nerves. Somebody will figure this out, but you may have to try several doctors. Good luck. I hope you feel better soon.