In an interview recently on The C-Realm podcast, one of the guests took an interesting point of view on emotions, thinking particularly of negative emotions.
His began from the premise that emotions are a sort of signpost. They tell us something, but there are two problematic ways that we sometimes deal with them: ignoring or repressing them on the one hand and becoming too attached or wallowing in them on the other.
What follows from that is that we should take our emotions seriously for what we can learn from them, but then we have to move on.
That said, I think there's still a thing or two to be said about what sorts of things emotions can signal, but as I need to get to bed AND I'm typing this on my iPod (computer's in my office), I'll leave those musings for another time, though you, dear reader, are welcome to comment as you see fit.