Change, change, and more change

Ok, so I'm trying to work through some mentally trying things the past few weeks. There is just so much going on lately, and its really begun to affect my mood. Normally, I think its fair to describe me as perky, optimistic, obnoxiously hilarious, etc. But lately I've been flat out crabby, irritable, and at times, I can admit, pretty unpleasant to be around. Try as I might, I just can't seem to put a finger on it. There is no one thing pushing me to be so crabby, its just the state I'm in as of late. What is even more frustrating is that I can't fix it. I try to will myself into pleasantness, coax myself into a smile and instead of happy, I find myself to be angry for having to try to push myself into being pleasant when I want to just bite someone's head off. I've wondered if its lack of sleep, but really, my kids sleep through the night almost every night, with the ocassional sickness or bad dream busting things up. I've wondered if its some other stress, but I don't think that's it either. So I'll just keep pushing forward in hopes that the things around me get better. I'll pray so that my soul gets nourished, and I'll try to soak up what is left of the nice weather we have been having, before the weather itself is enough to push me into a lack of Vitamin D induced coma. Has anyone else ever felt this way? What did you do about it??