Have you tried
paracord braiding?
I know you're having problems with your hands, but so was I when I started trying out paracord braiding. I was basically using it as a physical therapy.
It's kind of like macrame...actually, it
is macrame, just on a smaller scale. You can use just about any thickness of cord you want. The thicker cords might be easier for numb fingers to maneuver.
linky 1
linky 2
youtube linky