The I'm done moment? When I realised that my life was going down the drain in a constant fug of drinking. When I realised that (ever so gradually) my drinking had got up to a constant 3 bottles of wine a day. When I realised that it was affecting the relationship with my daughter. When suddenly I thought I needed to come on this forum to talk about it because of the realisation that it was only going to go one way.
Good luck with making the right decision :-)