As much as possible, personalize your work space. Display pictures of your loved ones. Tuck a few stress-relief toys like a squeeze balls into your desk drawers. Keep a candy dish, candle, or a bouquet of bright flowers on your desk. Post a cartoon or a picture that makes you smile on the wall of your cubicle.
If your company has rules against personalizing your space, at least place a couple of favorite pictures or cartoons in your purse or wallet. You can look at them and smile when the stress starts building.