Tooling,
If I'm not mistaken, you mean that you lived the first 30 years of your life without a drinking problem, then you developed one that lasted for 10 years. That's what I gathered from your previous posts.
My own drinking (except for a short time in college) was pretty sane up until my first divorce, at age 40, when I hooked up with another alcoholic--I drank daily for a year or so, stopped entirely for a couple of years, only to start again when I was in my mid-40s. I drank alcoholically for about ten years. I think I started drinking because I liked it, and because I could. I also think I liked it, in part, because it enabled me to avoid discomfort--I never learned to deal well with certain aspects of life.
I don't think it's necessary to figure out the "reasons" for drinking in order to quit drinking. A program like AA, though, will address those reasons so I don't have to go back to it.