Yep, get rid of FB. I haven't been on for over 3 years and don't miss it a bit.
You mentioned you like to read....I just read a really good book about meditation and minfullness: "10% Happier" by Dan Harris. It's a really down to earth chronology of how the author( a TV newscaster/reporter ) went from drug abuse and panic attacks on the air and his journey through learning about meditation and mindfullness from some of the worlds leaders, and also about a lot of his stumbles along the way.
You self admittedly "over think" things and are seemingly drawn into drama. Eliminating facebook is a good idea, but there is still drama and discourses in the rest of the world. You need tools...white knuckling will not work.