All mixed up

I am feeling great. Got my first Arts and Sciences project done (except for the research/documentation), work this week hasn’t been too bad… so why am I not feeling so great?
Oh yeah: mixed episode. It seems that I’ve entered one of those recently. Not quite sure when exactly, but I’m noticing that even though I think I feel fine, I’m not taking as much interest in the things I’m usually interested in. I have a research paper for A&S that I’ve been dying to jump into, but I can’t seem to make myself read more than a couple of paragraphs at a time. I was all excited to finish the physical work on the first project, but instead of feeling accomplished I feel… empty. I’m not writing, I’m not tweeting, I’m not doing much of anything that I usually do with my free time.
I think the art project was providing enough momentum to keep me going, but although I don’t feel like I’m depressed, I’m not acting like I’m not. Makes no sense? Well, it doesn’t make sense to me either.
I’m hoping that my mental state picks up soon. Well, not too up. Mid-level. Hell, just plain level would be nice.
Some day. I can’t be down all the time.