I Can't Draw Left Hand, I'm Disabled

My drawing hand has a vocal distonia, which means there's literally nothing wrong with my hand. The only thing i can't do is write with a pen. Do you know it's embarrassing when people ask me to fill on a forum and i tell them i can't, i'm disabled? I mean, i could juggle, i play the drums, i could play any instrument. There'snothing wrong with it physically. There's there's a little mental glitch that happened because i overused it, and then the brain said, you can't do any more, and thot won't let me. So i cant. My hand won't work when i put a pen in