I relate. I hung out in that same realm for years. If the day did not go just right, I'd "start tomorrow." Looking back, I was just looking for reasons, and "starting tomorrow" made me feel better about "tonight." As soon as I stopped this thinking, I was finally able to begin. I had to tell myself that, no matter what happens, I'm not drinking.
It also really helped me to identify the "start tomorrow" voice as my addict voice trying to get me to drink, trying to kill me. I stopped listening.