This isn't poker related, but I use to play a game that was in a lot of ways similar to poker, except it was an RTS called Company of Heroes. Instead of
gambling for money, you played for "rank" and how you stacked up to others, you would get promotions and demotions depending on if you played well or bad that day. I played the game for 6 years straight and never got awesome good at it, so my rank bounced around. Even though this wasn't money on the line, I got so attached to my rank standings, that I would get mad if I had a particularly bad streak.
A lot of skills in that game easily transferred to poker, such as not playing it when you are drunk or tired, and instead of gambling chips, you "gambled" with the lives of tanks, vehicles and soldiers. I think even a poker professional did an article on how a lot of what he learned playing poker professionally transferred to the RTS.
I use to throw my mouse, or I slammed a TV so hard that it left a big crack in the plastic.
I'm on Anti-depressants however, and pretty much episodes of me going nuts over that game, which had no money on the line, subsided to nothing. Currently Im playing microstakes, and even when there is money on the line, something I dont have a lot of, I dont really get all that mad if I lose.
Maybe its because I play 3 cash games at the same time, usually if Im down at one table, Im up at 1 or 2 other tables to even out the loss. I just got into tournament sit n go play though, so I hope finishing just shy of the prize isnt going to make me angry, otherwise Ill just go back to cash games.