I'm not sure, but I think the recent overload might have been something more than just too many annoying people bugging me during a busy time. I've achieved a lot between then and now, and now that the busy season is over (with good results!) I can sit back and look at the work that I've done and be at least happy with how it came together. But even then, it feels that I'm more aware of the issues that I though I'd resolved a long time ago. I'm not feeling as depressed about them as before, but they're definitely sticking in my mind. More and more I feel that it isn't going to get better, so I should move on.
And then I get a phone call which makes me even more confused...