Alcohol is definitely not the answer to the "how to control your emotions in a relationship, at work, anywhere" question. Some people start drinking because of their too-hard emotions. You need to know that it doesn't help and it only makes the problem worse. So better just don't drink alcohol at all or drink it as rarely as possible.
If you are spending time in a company of your friends or any other people and you feel that it's too hard for you because of your hard emotions, and you don't know how to control emotions at work, don't be afraid to leave and spend some time alone. It is your right and it is much better than staying there in a bad mood.
If you feel hard emotions too often, it is better for you to be as relaxed as just possible all the time. Caffeine won't help you with controlling negative emotions, as it has the opposite effect, so it can actually cause some of the emotions you want to get rid of. So better just stop drinking coffee and black tea.
There are days when it seems that everyone is trying to annoy you. Take a moment and think to yourself, could it be true that everyone around you made a pact with each other for annoying you? Unlikely. So just understand that it's only in your head and try to be more empathetic and remember that controlling your emotions before they control you is much better.
If you get angry easily, here is a page on Solutionbay where you can get solutions. Don't forget to choose all specifications which apply to you.
Anger can spoil not only your life but also lives of your close ones, so, of course, you and your family will be happier if you take it under control. "Letting Go of Anger: How to Get Your Emotions Under Control" is a book that will help you in it.
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