Getting rid of negativity.

If your thoughts return again and again to an unpleasant event, find something to do and distract yourself. The most effective way to stop yourself from getting worked up is to exercise or simple monotonous physical work. Jogging would be ideal for such an occasion. If that's not possible for whatever reason, you can do house cleaning, organize things in your closet, wash the dishes. Physical activity stimulates the production of endorphins, which push away negative emotions and causes fatigue that can distract you from bad experiences.