It is true that gambling sometimes acts like a drug. For those times when your chances of winning are very high and your expectations are high. I once bet $200 and my chances of winning were very high so I was excited for the moment of the result. Yes it was a big amount for me to bet so I was more emotional and afraid of losing at the same time I had trouble sleeping for the moment of winning.
I think this is because new gamblers are mentally unstable because of the high risk of losing money. However, this is a natural process that over time the mental instability will decrease and the win/loss will continue to run in a normal rhythm every moment. That is why excessive expectations while gambling are harmful for a gambler because the number of losses is more than the number of wins in gambling statistics and you should always be prepared to lose yourself.