Ah ha!

Sleep was the answer! I realized as i was leaving for the day that i was up late watching the Olympics. I didn't get much sleep. Whenever i don't get much sleep, my mood is VERY unstable. So. 8 hours is a must. I can function on 7, but any less than 6 and i am an emotional train wreck (as if i'm not already). Whew! At least it had nothing to do with me or any specific thing with me. Once i realized what was wrong, I felt some relief.