Avoid caffeine, such as coffee, tea, Mountain Dew, colas, and chocolate. Caffeine can keep you in a tense, aroused condition.
Do not smoke or use smokeless (spit) tobacco products. Nicotine stimulates many physical and psychological processes, causes your blood vessels to constrict, and makes your heart work harder.
Exercise during the day. Even a brisk walk around the block may help you stay calm.