How to stop blowing up at my spouse?

I am trying to control my anger and stop the constant arguing with my spouse. I have been reading a lot about it. My question is what do I do when he does something like blows through his money and can't get groceries or pay bills or is caught in a lie about something or makes a pretty poor decision that almost could cost his job (I found a txt msg to a woman he supervised that was blatant ual harrment). I blow up and yell and yell, but I realize it is not helping anything. He will always be him and I can either accept it or leave him. Still, I get so angry at what I consider to be stupid things he does that I cannot control my tongue. I think in the beginning I felt the nagging and yelling would make him do things better, but I see it is not going to happen. My desire now is to control my anger, stop the arguing and stress until I can finally separate from him. We do have children and I am trying to think of them.