It's been a crazy and, in many ways, difficult week here in the U.S. If you're having trouble working (as I am and I know many others are), grab your timer and do short intervals. (Even a minute or two!) You will make progress and, perhaps even more importantly, keep the material fresh in your head so that you can re-enter it more easily when you have more focus.
And who knows? Maybe a couple of minutes will lead to a couple more, then a couple more, etc.
Did I tell you I sometimes use dice? I have a great purple set from Chessex (gamers' choice; a cheap indulgence). Sometimes I roll a die to decide which part of my manuscript to work on. (Which chapter or section; they're all numbered.) It adds a bit of color and fun to the process, and randomness is a great tool against perfectionism because you can't really take a piece of writing that seriously when you're only working on it because you rolled it.
For those (understandably) upset about the U.S. election, a few tips: