I sympathise entirely Panache, having those moments play themselves over and over in your mind is awful isn't it? As others have said, I think it's important to cut yourself some slack and not get too overwhelmed by the memories.
Personally I try and make them useful (once I can get past the humiliated feeling) and turn them into reasons never to drink again; no point giving ourselves reason to feel even worse is there?
Day one will be over soon enough and then you'll be well on your way into Day 2 xx