Great points! Cooling your head off with other activities is a great way to think about your bets that didn't go so well and come back with a fresh spirit and body intact. That way, with a good mood, you are going to have better odds, in my opinion 
That will only happen if you do not put a lot of money in your bet that will make you feel uncomfortable and you are not able to sleep properly because of the loss.
Making yourself cool and not get worried about the loss will only happen when you put a very little amount of money in each of your bet and games. The moment you put more money and you lost that bet, there is no way for you to keep calm and relax. Management of portfolio is a must in gambling otherwise it's too difficult to survive in gambling.
in my opinion even though they allocate a small amount of money but if they are not ready to lose it is the same, so the point is we must be able to allocate money in small or large amounts that are ready to be lost.
moreover by allocating a large amount of money to gambling which is most likely a defeat it will certainly make us emotional, this also involves self-control because when emotions start to emerge then this is where self-control is important, if there is no good self-control what will happen is following the existing emotions, while when there is good self-control then you can put aside or ignore the emotion, but it is unlikely.