Work and Attitude

I've been a bit cranky lately. Okay, that's putting it mildly...I've been a bit bitchy lately. Negative. I keep criticizing everything and everyone I come across. If not verbally aloud then internally. And it's driving me nuts. Why am I like this? I keep trying to figure it out but well perhaps it has a lot to do with work. I get no communication from my boss (or much others). Communication is mostly over MOC or email, and when I am communicated to it's usually about something I did wrong or need to improve. That will wear on someone. It's not an overtly aggressive environment, more passive aggressive. So when you're surrounded by that, what do you do?