Yeah, the things we wish we'd said and done, and now the opportunity is gone forever, or at least until next life. It's a strange feeling I think is unique enough to have its own name, but I don't want it to have one.
If there isn't one in English, I'm sure French or German has one. They've got a word for everything. Haha
Haha true. Not sure if it's a blessing or a curse!