It's not so much about being back at work after being away for a while.
Yes, I have a lot of work to catch up with, but it's mindless and simple. It's more about the amazingly high stress level in the place. (I think mostly because everyone hates everyone else but tries to keep it down to a mild simmer of loathing that no one is willing to acknowledge.) The stress sort of shed itself in layers, slowly falling away, while I was gone. The moment the clock passed 8:30, and everyone was finally here, all the stress was dumped back on me.
And, so, life is not like a box of chocolates because even if you don't like the filling, at least you always get a little bit of chocolate first and can lick the chocolate to help get rid of the nasty taste.