There are many ways to deal with difficult or negative situation EFFECTIVELY are as follows:

• Figure out how to react.
• Before doing anything, give yourself a moment to calm down.
• In order for you to move on from this negative situation, you'll need to be able to let GO.
• Talk to someone about it; a friend, family member, etc. Vent about your feelings in a journal or blog, or even a loose leaf paper that you shred afterwards. 
• Look at it like an obstacle that you need to overcome.
• Instead of keeping everything cooped up inside of you, admit that you've made a mistake. Apologize and move on.
• The best way to deal with negative situations is to stay positive.
• Don't be so SERIOUS! Have a sense of humour and LEARN to laugh at yourself and your situation. 
• Step back from the situation and decide if there is a possibility of a good outcome.
• Choose not to be affected by it.
• Take something negative and use it to improve yourself. 
• Keep yourself motivated.

There are many ways to deal with difficult or negative situation effectively are as follows: