A: Ask for help
If you're the type of person who insists on taking on every little task, even when there is no room left in your schedule, you're headed for trouble. Don't be afraid to delegate or call in favors.
Regularly practicing deep breathing exercises can calm you and also slow the aging process. Sit up straight. Inhale through your nose while slowly counting to six. Exhale through mouth, counting to eight. Repeat several times. Instead of raising your shoulders while inhaling, let your abdomen expand with air.
Check the Internet for many variations on this basic technique.