Growli-

Where do you think these self-destructive impulses come from? Not just drinking, but other behaviors.

Is it to relieve overwhelming emotion, punish yourself, destroy your introjected parent? What could it be?

It's such a serious trait because it can be so powerful--it completely contradicts the instinct for human survival that most people seem to have. I have this problem too and I hate it more than anything. I think mine comes from the introject.