Hey there bixkf
How are you doing? I feel for you! I don't have the same loss to cope with as you do but I can relate in a way. I used to be very physically active and on the go...like full on....then one day over 10 years ago, my body shut down. Although I can still feel all of my body and can still move around, anything even remotely active...like hanging out the washing is exhausting. I have to lie down to recover.
From reading your post I wonder if what I need to do may also help you?
I need to accept the fact that my body is now unable to do much at all...and grieve what it used to be able to do. Grieve that I can no longer jump on a bike and ride, grieve that even though I'd love to try martial arts my body can't do it....I could go on and on...but I'm sure you get the idea.
As I haven't been through this process yet I've been kind of stuck in no-mans land where I am doing nothing...not grieving, not accepting and therefore haven't opened up to new ways of doing things with my 'new' body.
I hope this helps?
Sending you big hugs