Learn to let express your anger.
Go somewhere and just jump in the air - putting your hands up and shouting like a monkey.

Meditation is a great tool and just learning to breath is very effective so https://www.headspace.com/ has been very effective for me.

And generally knowing what you feel would be great so non violent communication really helps with that https://www.youtube.com/watch?v=4LuPCAh9FCc