I am having the same trouble lately. I blame it on the work flow. I am so unmotivated to work because it doesn't matter how fast I type I'm struggling with production with having to learn new client profiles, etc.
Today I turned on the radio and that seemed to help. It was enough to drown out other things running through my mind but not enough that I couldn't focus on the dictators. Chewing gum helps sometimes too...but lately no. I think taking a walk would help but I can't bear the thought of extending my time an extra 20 minutes to cover a break. I am ready to be done when its quitting time!