Gambling is just like smoking and drinking. Immediately you become addicted, then it has become a problem. That is why is always better for one to control it early before it goes out of hand. Immediately you become addicted, you can only control by yourself. Although it isn't easy but your self determination to stop gambling is the only key to help you out here.
Gambling is a strong addiction for people like alcohol where a person doesn't realize it at the beginning but later when it gets intense then people realize how much it has set with the brain in the person. Maybe it is not possible to stop gambling all at once, just like people can get out of drug addiction. However, if you get family understanding and support, you can get out of any severe addiction.