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.

I am 8 months post TKR. First 4 months hardly any sleep with pain. Only relief was to get up and walk. But couldn’t do that the whole night. My life was at a standstill from fatigue. Never had daytime pain. Now for past 3 months some nights are ok with some bad ones here and there. My prothesis must be ok as days are fine. I read that nerve regeneration can cause pain but I don’t know why the nights have been bad.