What a saga you’ve been through, I am so sorry. Mine injuries are a bit simpler. Fractured my skull in 1972 in a 14 ft fall but no broken bones except a cracked noggin and thankfully no other long term negatives I think. Second fall 1988 down stairs in home in Calif due to an earthquake that fractured L5 and led to a fusion. At 77 I now have OA, chronic pain syndrome, PN and all the long term crap that comes from trauma. You’ve had your share too and I believe it’s accumulated to where you are. Your expectations that medicine will have all the answers is short sighted. They don’t know it all and will admit it if asked; but, they’ll try to give you a diagnosis too if you keep asking them to try. Since my body will not improve and I’m not having any more surgery I work at keeping myself limber. I don’t know how much of your old regime you’re able to still do but PT set me straight and I still use them when necessary. Have you tried acupuncture and have you considered a homeopathic physician who work from a more holistic standpoint since you sounded fed up with what you’ve experienced.