Below are excerpts from an article written by Julien Tromenschlager.   See the full article here. 

1. Be aware of your emotions and observe them with detachment

• This ego and its emotional rollercoaster are not you.
• Your negative emotions only exist in your mind and you are not your emotions.
• The most important step to mastering your emotions is to recognize them.
• Then detach yourself from them.
• Think of your emotions as clouds and yourself as the sun: The sun is always there, whether or not it's hidden by the clouds.

2.  Accept the situation and focus on what you can control

• The second technique is to accept the situation triggering the emotions and to focus on what you can control.
• For the things you have no control over, accept them and let go of your need to control them.
• You can learn from your emotions. 
• Fear tells you to prepare, anger tells you to motivate yourself, sadness tells you to recharge, happiness tells you to celebrate and to surf on motivation.

3. Increase your self-confidence and remain positive

• Fear and negative emotions are often linked to our belief that we’ll not be able to manage whatever may happen in the future, thus lead to a lack of self-confidence.
• Increase your self-confidence by giving yourself proof over and over again that you have been able to rely on yourself in the past.
• Self-confidence builds up gradually with your successes, provided that you accept failure.
• When facing emotional ups and downs, it’s also important to remain positive and to keep in mind that every problem has a solution.
• "Most of our fears are a threat only to our ego, not to our survival.” - Thibaut Meurisse

4.  How to manage your negative emotions when you’re on edge

• Take several deep breaths and if you can, close your eyes.
• Relax your face muscles.
• Make an effort to soften your voice and to speak slowly.
• Try to put yourself in the shoes of the person who was the target of your anger to imagine what he or she must be feeling.
• Focus on framing your response in positive language.

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How to Master Your Emotions