But your gambling habit will control your gambling emotions. If you gamble with high amount of money, that is what will control your emotions in the negative direction, unlike when you use small amount of money that you can be able to afford to lose to gamble which will being you just good emotions even if you lose while gambling.
I agree with you. If a gambler gambles in moderation, he will react positively. When a gambler reacts positively after losing or winning, he maintains emotional control. However, in cases where a gambler is not disciplined with his stake he will react negatively as you have noted and his emotions will be affected.
Some gamblers are adept at faking emotions. In that, even if they have gambled wrongly and are upset, they will conceal their emotions so that those around them do not know they are upset about losing, but if someone tries to joke with them, they will quickly transfer the aggression to them.