on the one hand, I identify with your angst; on the other hand, it saves me from being tortured by a comma at the end of a sentence in a post I wrote last month.
Would I go back and re-edit everything? Of course, I do it all the time. That's why I start off breakfast by randomly reading an old story, amusing myself with the half-forgotten surprise of why it inspired me, only to discover a comma error, or worse yet, a missing word.
Perhaps we need to face the harsh truth that we can't always go back and amend ourselves or our work. But I do wish I had a giant eraser!!!