The spirit use to come to my mind whenever I want to play a bet and my mind will be telling me to increase the $5 I use to gamble everyday to $10, but I use to ignored such spirit because my daily budget for gambling every day is $5 and the moment the $5 didn't bring good results from the gambling, that is the end of my gambling in that whole day .
This voices from the head is very easy thing to deal with because I think it's normal thing to have your mind giving your some advice. The best way to deal with this is make sure that you use a tight management of risk in gambling. If you have $100 as initial bankroll, let's that be your bankroll and no additional funding should come from anywhere. If from that $100 and $10 will go to each game, let it be that $10. With this strickness and personal rules, even your head wouldn't be able to mess with you.
Most often greed is the reason why here this voices, you probably have $10 with $200 return after making multiple return and despite that having a return of $200 looks more risky, your voice will still be telling you that why not try $40 so that you can round the outcome to $800. If you do and you don't win, you have miss the opportunity to gamble 3 more times and if you don't have nothing in your bankroll, that's all for you for that period.