It’s a lovely, albeit somewhat tragic sounding, protrait of the committed writer. The intensity seems to border on insanity which makes for a good sort of mystery/possibility/implications to the piece. The line about his mind going a mile a minute is a fragment, and I think it would read just as well or even better as, “His mind goes a mile a…” The second half could stay with the gerund form. Very nice story.

“The poor keyboard, only a few years old began to shows starting symptoms of wearing.” needs some work.