Sorry for your such a condition. It is very sad to see you were addicted to drugs and then transferred to gambling to gather more money than you earning. It is nothing but greed. It is a great mistake for you. Money should be used on gambling; only those amounts can be afforded at a loss. But if you use more than that, you are in such a situation. I think now you should stop all types of gambling as well as drugs to save money which will afford your livelihood as well as visa application for study.