I felt this way a few months ago.

My solution: work a set hours and everything outside is my time to do whatever. I treat it like a job, I work 9-6 Monday-Friday and anything other than that, I go out any try to forget things. It was hard at first; it was like an addiction withdrawl. But I got over it and I am much happier now. It just makes me concentrate and work harder during those work hours.