I'll let you in on a little secret eternallife, every single one of us - alcoholics or no - have moments when we literally cringe inside over something we've said or done in the past. And it hits you at the oddest moments, like when you're in the shower merrily scrubbing along and "omg-cringe-ugh-cringe-geez-cringe".
It's a part of living life.
That said, the best I can do is to try and never do whatever it was that I cringe over again.