5. Take a deep breath!
The first thing that you really need to do is take a deep breath and calm down. You are mad and you want to say harsh things but look at them for a minute. Ask yourself if you really want to scream at the person in front of you because they are important. Do you want to do any damage that you will regret later? People tend to think less when they are angry so you should act smart and stay quiet until you have calmed yourself down.