I've been in the same kind of rut where it seems all I do, when I have some free time, is sit in front of the boob tube. Two things that might help, both of which I'm doing, is to up your intake of vitamin D (it's what you get from sunshine), and do something just for you that is OUTSIDE of the house!
My rut begins at my easy chair and doesn't extend beyond the four walls so I need to get away and do something different. Last Sunday, I went to the movies by myself to see a movie my boyfriend wouldn't like but is right up my alley ("Sanctum", about cave divers). I left the theater feeling rather refreshed and proud of myself. Try it, you'll like it!