The tragic story of guitar virtuoso Jason Becker who suffers from ALS is another one. He was diagnosed in 89, at the age of 20, after joining David Lee Roth's band. He managed to finish the album they were working on deaspite his hands being weakened, but he could not tour. And his state quickly deteriorated. By 1996, Becker had lost the ability to speak, and he now communicates with his eyes via a system developed by his father. He continues to compose with the aid of a computer.
I was going to share a personal story but let's simply say that I have lived with a sword hanging over my musician head - nothing as tragic as Mr. Becker's story, though. But enough to know that my guitar playing days may be numbered. And it's not a pleasant perspective. That being said, it's been accompanying me for decades, so I guess I am somehow prepared.
Ironically, my music rarely features any guitar, and the most important thing for me is to write music, so I guess it's not all that bad. But I am sure that if I couldn't play anymore, I'd go insane not having that option and my head would be buzzing with guitar music. So I can relate.