Most of the stresses and anxieties I have can be linked back to my hands. Being prone to RSI causes a lot of pain that feeds into fears of not being able to make work, or of never being able to make enough.
And it's easy to feel betrayed by your own hands - why won't they make better work? why can't they work faster? why aren't they good enough?
So you push yourself all the time, and if you don't take a step back to breathe now and again, getting anything else creative out of yourself is like getting blood from a stone.