Hi
Sorry to hear you are struggling so much. I think the fact that you are here and that you had such a huge pain reduction a while back means you know on some level that your pain may well not be physical in origin.
Of course none of us can say that your knee is completely fine, and as always you should get everything serious ruled out which it sounds like you have done. I know the swelling can easily drag you back into physical thinking. I just want to share a bit about a good friend of mine... As it's knee related
He struggled with low back pain for years, and without any real reason it went away. Then he started getting terrible knee problems. He didn't know anything about mind body problems.
I have watched him in the last two years be incapacitated by pain and weakness. He can not walk up steps, he can't run, he lost so much muscle from one leg as he couldn't walk on it. He saw endless doctors and had so many treatments and physio exercises to do. Nothing helped in the long run. He was told he had patellar tendonosis, not tendonitis...meaning degeneration of the tendon. So he believes his knee was basically falling apart and he would need to rest for months or years to even have a chance of recovery. I massaged his knee a lot to try and help, and it was quite swollen at times too, which alarmed me.
At this same time I developed my own chronic pain problem in my throat. I learned of Dr sarno and got huge relief from reading the books. But my pain then got worse again. I continued to work on it and follow the mind body approach over all else, which I can say is finally seeming to get better. Still a way to go but I'm getting there.
My friend showed a little interest in all the TMS stuff, but was very sceptical too and didn't even read the book. He is very scientific and rational, and it makes it hard for him to fully accept the TMS theories.
But recently in desperation he went back to Belgium where hes from to see one of the best doctors who specialises in his problem, they did some tests and the doctor said it was mostly psychosomatic! He said there was little or no degeneration! I was amazed after everything he had been through and been told.
Unfortunately I still don't think he can really accept it, which is holding him back...but he is doing better than he was. After years of conditioning yourself to be scared , to walk differently etc it will take time to shed those old habits. It has for me
So it's not a happy ending yet for him, but I thought this might show that even when you can't walk and it's feels completely physical and there is swelling, it can be psychosomatic. My friend goes through phases all the time of feeling much better and then being unable to walk again, and he is under a lot of stress, but says he doesn't feel stress, which is a bit of a give away! All of these factors and the Belgian doctors diagnosis is pointing towards TMS.
So keep hopeful, you have already seen that you can be in less pain, hold on to that rather than what you are going through currently. It will pass.
Good luck