Nice work on day 4, day 3/4 were usually the hardest for me too.
I think you are spot on with your realization as well - physical detox, while unpleasant, is fleeting and finite. Coming to terms with a sober lifestyle is a much longer process, and it's a very difficult time - many do return do drinking at that point. Having a plan in place really helps, I hope we can assist you in that area.