Career Suicide or D.O.A.?

If I have more than 2 or 3 drinks I lose control and cannot stop myself from going crazy. I do not always remember what happens later on in the night when this occurs and there have been a few instances when I have woken up in a surprising location – like in my car in a supermarket parking lot with no recollection of how I got there. Whether or not this makes me an alcoholic I do not know since when I am on my own I rarely drink, or if I do I would have only a glass of wine occasionally. The challenge I face is that my job demands that I be out competing for files and winning business 2 or 3 or sometimes more times a week and the guys I am courting are investment banker and very senior finance types and they like to play hard and they expect that I be up for what may or they aren’t going to be calling me for work anymore. I live in an eat what you kill business environment with a lot of people depending on me to make these deals. The reality is, if I start ordering club soda they will be very respectful of my wishes but I won’t get the call next time to go out and discuss business. This long preamble is to explain that I cannot simply stop drinking entirely, but I need to learn how to control myself after I get a few drinks in me. Please do not suggest that I stop entirely because this is impossible. It would be career suicide.