If it does not work try this:
1. - Delay your reaction; separate your emotions from your actions
2. - Understand why are you so disappointed. Do your homework.
3. - Do not play the victim; the worst thing you can do is blame the entire universe for your problems.
4. - Find a safe haven to relax, to get distracted, to be alone, to focus.
5. - When you feel ready, react and make intelligent decisions.
Own your anger. Don’t let it own you.