block your internet 
That will help for people sometimes but not always, because see it is like you leave the college because you do not like a teacher. You have to cure the disease friend, stop using internet also means you can not earn anything then. Better block gambling sites. But that too not effective in my own experience. Even you make all gambling sites blocked which maybe comprises of a hundred of sites.
It is still too easy to unblock it through your router settings though browser or through the application he used to block those website.
The best thing to do regarding on that problem is to have a self discipline and request an emotional support from your family and friends.
I think blocking the sites is a good idea since yes you can change it again but you have go and log into your router and that takes time. Rather that then nothing. Ultimately the best way is self control and support. Blocking is a very good idea, don't say "oh but you can turn it off" obviously you can it's not about that it's about adding an extra layer of security. If you do decide to unblock sites you have to take the time to decide which site you must unblock and login and out of your router and possibly reset it, this is all a pain in the ass but you guys talk about it like its as easy as turning a light switch off and on when it's not. If after you took the time to unblock a site and then you still gamble then you have serious problems and need counseling.
This is one of the option, block the source of gambling and that is your PC, stay away from it for a while. Have a vacation where there is no internet access. Stay there for sometime. It maybe hard in the beginning but if you are really serious on quitting this stuff, you can do it yourself or seek an specialist for an advice.