Welcome Slan - Being left alone was a biggie for me, too. The first time will be the hardest, so if you're going crazy, come here and read, read, read (and post). It will remind you of why you need to do this and give you something else to think about. When that alcoholic voice starts in tell it "NO!"
Getting to day 12 is awesome - you (and your son) deserve a happy, healthy life. I'm so glad you're here - keep going, just take it a minute at a time or an hour at a time. You'll be so grateful you did.:ghug3