A few years ago I was offered a great job at a Casino, five nights a week, three hours a night, for $1500. a week. Only thing is I had to play their grand piano, actually just background music in a lobby. I borrowed a digital piano with fully-weighted action and practiced for a week.
By the end of the third day, it was apparent that I couldn't do it. My hands ached all the time, fingers hurt and were stiff, wrists hurt, etc. I had to call and cancel the upcoming job.
Arrangers don't hurt my hands, but even now I can't play those with heavy actions, and it is counterproductive to my playing style anyway. I need fast action with which it is easy to activate the sounds. The Korg PA4X is about the heaviest I can handle, and it isn't very heavy. I can even envision having to go to a PSR-like action at some point in the future, but by then, it will be just for fun anyway.
The point is, if I were a piano player, I wouldn't be able to work!
I find Naproxen (Aleve) helps me, so I take one occasionally when I'm hurting. It seems certain changes in weather trigger the arthritis or whatever it is.
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DonM