Vitamins A, C, E and Beta Carotene can decrease stress. If you smoke, stop completely. Although you can use alcohol and other drugs to relieve stress temporarily, they do not reduce the conditions that caused the stress in the first place. In fact, they may be habit forming and create more stress than they take away. Seek health and medical care.
Preventative medicine is the best kind.
Get a massage. It is a wonderful way to get rid of physical tension. Stretching can relieve stiff necks, often caused by tension. Take a long, warm, uninterrupted, relaxing bath. It's OK to cry.