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When emotionally unstable, you shouldn't risk a lot, even during that time. I have thought of mentioning this post here. Whoever finds it useful should read it.
I want to hear more ideas about how someone stops or controls their gambling habits.

Risking much is not good any time, not just on times when one is emotionally unstable.
Viewing at gambling as a form of entertainment is most healthy view, with firmly set limits how much one should spend on gambling session.
Gambling should not be viewed as distraction from problems because then things can go out of control.