How about a sort of “passive” approach? If your mind is already on overdrive, then trying to add more things might be too much. Simply refuse to think further any of the thoughts that come to your mind. Instead of trying to tackle every one of your thoughts, just nod and let them go. Or, interrupt your thoughts. Ever been interrupted constantly? After a while, it’s almost impossible to finish a sentence or even start one. Same goes for your own mind. Just stop the thoughts again and again and again. After a while, the thoughts stop being so intrusive.

I also think that it would be terribly important for you to take a break from Facebook. It’s not good for you. I was away from there for a long time. When I went back, after a while I started to notice how it deteriorated my mind. I was constantly somewhere else, not in my own life. Seriously, at this point, it would be easier to take away one negative thing than to try to compensate for it with extra activity. Especially if you find it difficult to focus.

Those two things require much less energy than you might think. You don’t have to introduce new activities or habits.