I feel you on this, and I felt that way for a long while, too. I think the best thing is to have regular activities and people in your life that pull you out of the everydayness of things. It helps to have someone bug you when you're working too much or falling down the rabbit hole. I know it sounds trite to say "get off the computer," but it's true. I'd recommend something physical, because even reading and watching movies can feel like a part of the same beast you've mentioned. (And, to be clear, those things aren't bad, they just aren't going to be a counterbalance to that kind of intellectual/creative indulgence.)