cranky all the time

I've been cranky for like three straight weeks. And I'm sure I'm hard to live with right now. It's just like NOTHING goes right. It's nothing major--I'm healthy, baby is healthy, but it's little things. My three hour commute, for example (I type this while sitting in standstill traffic for more than a half hour at this point). And just general constant fatigue. My job sucks. I work all the time so I don't have time to do anything other than work and sleep. I want to exercise, but I don't have time. Somebody teach me how to not be cranky. I'm not mean to my husband, I'm just yelling at my computer, or bitching about my car, or whining about everything. Anyway. Back to crying in the car over dumb shit.