Chess is a game of honor, you shouldn't use chess tricks to win. After all, you don't fight your opponent, but you fight yourself and struggle against your own mental limitations. To get better you have to beat yourself and change the way you think.
If you get upset then you can't think clearly. You must avoid getting irritated or annoyed at all circumstances as this will block your thought processes and you are unable to analyze a position clearly and then you might make a blunder and lose.
But sometimes hard measures has to be taken. There was an indian player who used a Bluetooth-Headset to keep contact to his helper who analyzed his position using a chesscomputer and gave him gave him Chess Tips. The FIDE barred him from tournament play for ten years. The earset was discovered by FIDE Officials by chance when they walked around and passed him.