Keeping a paper wallet is the best security method, one generated from an offline PC and encrypted with a password that is both memorable to you and secure, That's the very definition of security IMO.
Of course, just having a PC wallet with a good antivirus/malware can be enough if you are careful enough to avoid any possible mines.

There are several methods, getting help and using one of gambling helper sites is one, or going to some rehabilitation, the easiest method would be having some self control and setting limits to yourself, or leaving gambling as a whole.
Getting your money in a cold wallet that is locked to you is a step in the manual process.

The second best in Nitrogensports IMO, I've used DB from a year and even their odds were lower than competition they offered live betting on allot of games and instant payouts and good support, but now I think NS is the best even without live betting..
BTW Why did DB close? They seemed very fine.. maybe double spending or law enforcement pressure?