"Be proactive, stay focused and think positive". We have to keep our mind and our mood calm and balanced, so that when faced with unpreditable circumstances, we would know that we made the best decision.

Be proactive. Instead of focusing on pessimistic thoughts, think of how we could change the situation. I always share with some colleagues to cheer them up when they were down.

Stay positive by surrounding myself with positive people.
Exercise. It's well known fact that exercise make us feel good. That's why I go into the swimming pool every evening for a 'walk' as daily exercise. This can help me relieve stress.