I know how you feel. Today I had an unexpected day off and the default thinking mode is how to use this day efficiently. I decided against doing anything productive, but even then I try to make sure I read the "best" book (ideally a classic) or find the best spot to enjoy my coffee, which should be the best as well. It is crazy.

What works for me, which I eventually managed to do today is to get off the computer and get outside. Just pick a direction and go. I took a bike ride, brought a coffee and a book and just sat on a bench watching people, reading and remembering that life is good. It doesn't really matter what I do as long as I get out. Nature works best, but going to a museum or just some new shop in the neighborhood also works. Even if I feel awkward as hell in the beginning as it just feels weird to do these things alone.