Maybe you should find some hobbies, try playing some sports, go to the gym or something like that, if you cant stop maybe you should go to the doctor, if that dont help you and you sitll gamble, try to set limits for you how much are you ready to lose this day, try lowering your amounts every day.
Having more things to do will definitely help, especially this gets you mind out of your addiction or whatever you want to get over with. Doctors are probably a last resort if things do get worse, and likely any addict would be in denial of his addiction so he would never got to a doctor. I'd say the best help would definitely be to tell your family about your addiction or whatever you are going through.
Limits may help, but what is really stopping your from depositing more and more into the casino, effectively breaking your limit? Getting out of an addictions is truly a difficult and hard thing to get over.