Are you working any kind of recovery program? I'm sober four and a half years in AA. The 12 Steps are really designed to change you from the inside out, so you don't have the knee-jerk need to deal with strong feelings by drinking. I know you don't feel like the childhood rape affects you any more--maybe that's true, or maybe you have just buried it deep--but for me, I had learned to respond to any anxiety-producing incident by having a drink or ten. I might be feeling happy or sad or neutral, but it becomes a go-to response.
It's more, and deeper, than just a bad habit, like biting your nails. The disease becomes who you are--and if all you do is take away the alcohol, there is nothing to take its place.
If you haven't been to an AA meeting, I suggest you give it a try. It can change your life.