While understanding the need to feel you’re having some control by an exercise programme do give things adequate time to have an impact maybee.
There is definitely an issue somewhere, perhaps your knee perhaps a referred pain. You must be more than frustrated with the situation. I can’t suggest anything helpful other than keep moving as much as you can and definitely don’t overdo any exercise you are given. That’s as bad as doing nothing.
I’m beginning to think I was more than fortunate with my TKR experience although I laugh sometimes when a medic, the most recent a pain clinic consultant, asks if I do my exercises. I have them for knees, muscle strength in legs, lumbar spine, cervical spine, shoulders and hands along with a raft of Mindfulness exercises. I’d do nothing else if I did them all every day!
Constant pain is so debilitating and the effects poorly understood, no wonder you’re finding life difficult. I hope you can rest well tonight and you get that call from the GP soon.