I feel for you and I'm sorry you also are going through it. I don't blame you for taking umbridge with this all. But I also live in constant pain as well, after a dog attack a few years ago I can't walk for more than an hour at a time, laying sitting and standing all hurt and even with pain meds, I can only get to a dull ache. I can't work and the life I had before is gone, it was such shit trying to prove to skeptical condescending doctors saying just to do stretches and it will get better, but... Here I am still waiting.
So while I feel where you are coming from with this time of chronic pain, I am ready to deal with this and other life debilitating conditions if I also get to feel like it was to run again, to climb, to see through the eyes of an athlete. To be able to walk normally and enjoy events again. I'd take my own pain and yours again to feel human again.