I'm pretty fed up of people whining about trolls to the point where virtually every thread the OP gets accused of being a troll.
Anyways, I have a question: Do you perform better when angry or calm? You must evaluate this first to see which emotion brings out the best in you. Try it out and see, play some unrated games and keep calm and then play some rated games and feel free to be angry. If you play better angry my advice is use your anger, vent if necessary, and swear.
If you are performing better calm then we can discuss calming methods.
dont play chess, take up that other great sport!