I think it's a crazy thing. I shake so badly at times, there is No Way I can type, or write with a pen. I can't understand my own handwriting. Ever.
I have a tbi also, but, sometimes the shaking is a little blessing, if you can believe that.
It does keep you from "freezing up". The "one position" thing is a No No for RSD!
Stay in one position too long, like sleeping for instance, and it's like trying to break out of a block of ice..

Alright, it's no kind of blessing. It's just different.

I'm sorry that you have this....

Pete
asb