Work at adopting views that are more moderate. Put the situation in perspective. Don't wallow in negative thinking, or going over and over things that have already passed. Moderate your physical reactions to stress. Slow, deep breathing will bring your heart rate back to normal.
Relaxation techniques can reduce muscle tension.
Aromatherapy can serve as a continual relaxer throughout the day. Disciplines such as meditation and exercise refocus the mind and body. Yoga, massage or other holistic practices may also be worthy of consideration. Maintain your physical and emotional reserves. Maintain supportive relationships rather than surrounding yourself with negative, critical people.