It should be OK to just call some days a loss and go home early. I think people would be a lot happier and more productive overall if we could do that. Just say "Fuck it, this day is sucking and I'm done."
Barring that, I could really use a hug. Actually, I could *really* use laying down in a cool, dark room cuddled up with someone I love, and just forgetting the rest of the day.