Don't let stress get ya down! Rather, use it to your advantage. If you're having one of those PMS-enduced, want-to-punch-something kind of days, do something about it! Don't sit there and sulk, even if you had a huge blowout fight with an employee or your boyfriend dumped you or you're just plain pissed off. Trust me, sitting there and thinking about it isn't going to help the situation one bit.
Instead, make use of this steamed energy! Get outside for some fresh air, go for a swim, or a nice, long run on the treadmill. Trust me, you'll feel great afterwards!
Take my sister for example. Last week, she came home from work in one of those moods. You know, steaming with anger and nothing anyone said could help the situation. But, instead of sobbing and complaining, she went to the gym and was able to run 30 straight minutes on the treadmill, harder than she ever had before. And when she came home, she was glowing with happiness (and healthiness), as if nothing had ever happened.
So, go out and get some good endorphins and you'll feel so much better instantly. Trust me : )