What do I change?

So earlier today I was feeling great, I was all full of energy. Excited and giddy, feeling like I haven't felt in a really long time. I took a nap and when I woke up the sun was gone and it was late in the day. I turned on the tv because I had been staring at this screen for way too long earlier. The only things on tv are really depressing movies, and now I feel like crap. The bottom of my stomach has fallen out and I do not feel up to smiling. I'm not sure exactly why. Or maybe I do know why but I don't want to admit it. Whatever it is, it needs to change.