Exercise increases your brain's production of endorphins, which will help you recharge. Going for a walk or simply doing stretching exercises and yoga will loosen up the body and leave you feeling more relaxed. Take time to breathe in and out slowly, telling yourself to relax as you do so. You can also buy relaxation tapes to help you forget your worries. Leave early enough to get to places on time, and plan to get shopping and other errands done before the last minute.
Visualization is a powerful tool.
Create a mental picture of everything going fine, or picture yourself putting your frustrations away in a box.