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To gain control of your emotions, take a moment to take a deep breath, hold it for 2 seconds, and then exhale. Keep breathing like that until you start to calm down. You can also try focusing on something around you, like the way something looks or smells, which can help bring you back to the present so you're not caught up in your emotions. If you're feeling overwhelmed, try doing the opposite of what you'd normally do, like walking away or not saying anything at all.
Video: How to Gain Control of Your Emotions - wikiHow