I only rage when I play Halo 3 BECAUSE I HIT THE FREAKING MELEE BUTTON FIRST! WTF I 4 SHOTTED HIM! AAAAAAAAAAAAAAAAAAAH! When I play other games I'm super cool and relaxed. No worries about losing or dying.
I quit at the end of January this year. What helped me is that I finally found a stress free job and most of my main worries were gone. Without a great amount of stress on me it was easier to quit. I sometimes forget I smoked for 14 years.