A technique for times when you are about to tilt off the face of the earth..
Mute the game sound.
I know it sounds crazy and I know you won't hear pings, but this is a last resort option that works.
Just had a game where I was getting 3 man enemy ganks over and over. I reasoned with myself, I muted everyone...I still felt angry.
In a last ditch effort I completely muted the game sound.
Suddenly the only sound I heard was the silence of my keyboard. I was immediately able to calm down and focus on the minimap.
In the end we managed to turn the game around and won a 44 min slugfest.
So the next time you're about to lose control, try muting the game sound. It's a jarring move that forces you back to reality.