So, today was a particularly tough day. Rather than going into the details, I think it's more appropriate to re-post Shawn Kelly's tips and tricks article, "You Are a Tool" (from Nov 2006). The title makes it seem like a negative topic...upon reading it again, (and having a fresh experience to relate it to), I see that it's a very positive article. It's really all about how to handle unexpected revisions to your shots.
It's nothing that I didn't know before, when I read it last November. But I tell ya what, the day your shot gets unexpected revisions, read this article again. It's one thing to know this stuff when you're not going through the emotional repercussions of the event, at those times you can say "yeah, I know this" and put it away. But keep this article bookmarked, and re-read this at those times you need it the most. I feel a little better already.