I Just Don't Know

What don't I know, you may ask. Feels like I just can't figure out anything some days. I don't know if I am just tired, or if there is something from my subconscious that is nagging at me, but ever since yesterday afternoon I have had this sort of nagging sense of dread. Something isn't right, but I'm not sure what. Maybe I just need a good night's rest. Or something chemical to modify my mood. Whatever it is, I wish it would go away.