Setting your self a guidelines when you gamble doesn't going to work everytime, so you'd better choose to be a responsible gambler, the kind of gambler who thinks first of his family's basic necessities rather than gambling like a one day millionaire out of frustrations.
Yes, the emotion will always there but as long as you can control your emotion, you will not have face a high tension in gambling. The high tension will only appear to you when you feel the emotion, like for example, when you lose, you become angry and sad, that can be a trigger to have the high tension, and in the end, you will lose the money without you know.
I agree that better to be a responsible gambler which not many of the gambler can do. Sometimes, they forget to think about their family and fills their needs because of the attracting of gambling.