Everyone has different tolerance levels and reactions to stress. Some thrive, while others can become ill. The key is to determine the level of stress at which you function best and then to figure out the best way for you to cope before it gets beyond that tolerance level. Learn to admit when you feel stressed. You should take the time daily to think about what caused you stress that day.
Indecision is one of the worst stress producers.
Decide what you want out of each situation and then act upon it. Accept that you can't control every situation. Concentrate on controlling the situations you can and learn to live with the others. Share your problems with someone you can talk to honestly. You can choose a friend, group, clergy or professional to help you find new ways of coping.