You need to be in control of yourself. This means calculating every single decision you do. If you manage to subtract the feelings from the decisions you make you will be able to null the greed and generate profits.
I think anybody's advice cant help him/her except he/herself...you are the one reaponsible to yourself on when to stop because in gambling almost anybody won't listen for advice:when they are winning they want more then when they are losing ,they want to get it back..