"Why do the most successful firms in the world employ a risk manager?" Answer the question. You've never actually worked for a company, have you?
Hire a bouncer-type part-time and let him sit next to you watching the PnL, when it hits a pre-defined level have him rip the power cord out of the wall. Seriosly though, you can't just shut everything down at a certain point and leave the house/office? Run errands, play with the kids, drive around in circles etc. Find something to do that doesn't allow you to log back on. What you're talking about is a pretty dangerous gambling mentality. Maybe you can find one of those trading coaches/psychologists to help you out. Just a suggestion. P.S. I don't think comparing an independent trader to a firm that employs risk managers is valid. In many cases someone working at a firm doesn't have the same dis-incentives to dangerous risk taking as someone who only has their own capital on the line.
Ticktaker, You let them sucker you into a pissing contest. Try support@ninjatrader.com or their free online training sessions. Both are very good. Best wishes to you.
I'm a big fan of positive habits or "life hacking". Why not start creating a new habit so that when X occurs you then do Y that keeps you away from the computer.