Comment by hiAndrewQuinn

Well, productivity is good. It's good to solve important problems and to move them out of other people's way, so that they can solve more important problems to move out of others people's way, and so on and so forth. It's probably a good and natural thing to feel happy when you've been or are being productive. I don't see a problem with that in a vacuum, that just seems normal.

What's less normal is tying yourself to being unhappy to being unproductive, which obviously sucks when you're in a productivity lull. I don't know what the solution is but I think that's the half of the equation I'd focus on.