I can only offer my perspective, but I think us drinkers pass "the rubicon" and when we do there is no turning back. We are fine for years, then all of sudden, there is no hangover....only withdrawal and anxiety and panic. And once we reach that point, there is no turning back. That was my experience. I did not get hungover towards the end, only mild withdrawals (I was a weekend binger). It's kind of depressing because if I'm ever to binge again, I know what I'm in for. It actually motivates me not to drink because I hate it so bad.