It's important to stop and take note of the fact that we live in stressful times. The economy's bad and will remain so for a long time to come, there's a lot wrong with our politics, there's social confusion on many fronts...all of this takes a toll, and more so when we don't quite notice it consciously but still experience it at subconscious levels.
Feelings come and go, like waves on an angled beach, and sometimes they converge to make an extra big splash. It's perfectly okay to realize, "Oh, okay, I've just got the bad feelings piled up right now. Is there something constructive I can do for myself? Or maybe I just need to keep as much inner quiet as I can, avoid big drastic mistakes, and wait it out."