Really sorry to hear that John. I wish you a good outcome whatever happens and hope you'll be back in the shop somehow/sometime. I find it helps keep me sane (better said, "saner than I would be otherwise").
I don't know if it's any help but there's a bloke on here who lost one or both feet, another with all sorts of neurological problems meaning he can hardly move his hands, and another here who's only got one hand/arm. No doubt others too.
If you want what for me is a really prime example of "mind over matter" a young woman (about 30 I guess) belonging to out choir comes through the (quite busy) city of Basel to practice every week. She's confined to a bed (literally) and can only lie on her tummy, slightly tilted to one side, with her head lifted up by a pillow affair. The bed (and it is really a bed-sized bed!) is battery powered, has lights front and rear, and is controlled by a small joy stick set up in front where she can reach it with her right hand. She steers that "bed" through city traffic and back every week (the normal cars, vans, lorries, buses, bikes, etc, found in every city, plus we have trams in Basel too). "She's got balls she has"! How she does it I just dunno!
But it certainly serves to regularly remind me that my own problems aren't SO bad after all.
Maybe that "picture" helps you a bit? I do hope so.