Walk away from the computer. Easier said than done, I know.
Get outside, get some fresh air or just sit someplace and people-watch for a while.
Don't come back to the computer before Monday.
When my kids were younger and in boy scouts, I went camping with them a lot.
Those weekends away without any electronics (no cell phones allowed) were the best for clearing the head and getting refocused.
Finally, I partied with my friends yesterday in his farmhourse, we all had a great fun, now, I'm back with a fresh mind...
Cheers and thanks everyboday for your suggestions