Problems w/ making snap decisions

[1st and 15]

I am a fairly successfull full time player who is back to MTTs after spending most of 2006 12-screening SSNL. My main leak (by far and away) is that sometimes I will make decisions in the snap of a finger w/o thinking, almost knowing what I'm doing is -EV and always immdediately regretting doing it right after I hit the button. I know this sounds like such an easy thing to fix, so flame me if you will, but I can't seem to get past this. I've been a successful pro for more than a year and my biggest leak is some non-poker related nervous tick (I also have this problem in real life situations).

FYI - I have already had multiple talks with myself about having identified this problem and the subsequent need to eliminate it. That, and I can be bothered to the point of sleelessness when these mistake are particularly egregious. Please help me out psychology.