Hi,I had the same problem while on lithium, I noticed my typing (which I'm quite good at) and basically used to do for a living slowed down dramatically... then I lost words (for a lack of a better explanation) my excellent memory was suddenly shot to hell and if that wasn't enough, the tremors started... and they got real bad, at 1 stage, I couldn't button my daughter's school shirt Since quitting, my hands work fine again, except words more often than not, look wrong, and this confuses and frustrates me, as it was NEVER a problem before... eg. Today, the word analyze had me in a tizz cos it just looks wrong... very frustrating.

My brother would flip if he's guitar hands slowed down, I suggest you consult your pdoc and get it sorted.
Goodluck