These are highly efficient massive stress responses, but misplaced and obsolete. Maybe in a couple of million years the stress response will evolve out of existence. However, this doesn't help today's individual. Stress responses were designed to end in physical activity. This is the time to move, to use up the stress products.
Physical exercise is the answer.
Not only does it channel and exhaust stress responses, it also diminishes one's reaction to future stress by conditioning relaxation. Those who keep fit generally reap the rewards of mental alertness, good self-esteem and fewer spells of depression and anxiety. Even exercising during the next 24 hours will help. Although exercise is a form of stress in itself, the muscular, respiratory, metabolic and central nervous system react positively to exercise, strengthening one's ability to cope. Regular exercise is especially beneficial.