It's almost impossible to just turn off the emotional connection we have to our teams just like that. I'm also an Arsenal fan and I know first hand that Arsenal have very passionate fans.
You need to understand the psychology behind what is going on. When Arsenal loses you are hurt emotionally. Football has taken over the traditional role that religion used to play for some people. You should take a step back and try to analyse your behaviour and that of other fans. Try to experience the emotion without overreacting... you know — take a step back and learn to control your emotions.
Try new things, take up new hobbies, travel more, broaden your horizons, educate yourself. Grow as a person.