In reply to Gary Gibson:
I obviously don't know the exact state of your health issues, but unless you are only motivated by achieving the standards you used to climb (which I doubt is true given the amount of time you've been climbing, your age, and what you've given to climbing), then these physical limitations are setting you a different challenge to which you can adjust.
So you won't be able to get satisfaction from achieving high standard technical climbing movement, instead take the satisfaction and joy from the other aspects, getting to nice places, meeting people, being out there, etc.
Good luck, keep going and don't give up.
Post edited at 09:52