I can relate to wanting to cancel skyblue, I've had that feeling before. Interestingly, those weeks that I think would be fine to cancel for any/all of the reasons you've listed, well, those sessions always have some sort of moment in them that makes me go "I'm glad I didn't cancel!" It's one thing if I'm sick - of course I'll cancel, but otherwise, I figure I might as well take advantage of, if anything, getting to sit in a quiet, calm, peaceful space for an hour!

Sidebar - I have been on the other end of someones last minute cancellation - the side where I am desperate to get in to see T but T has no openings. Then the magical phone call comes that T had a cancellation and I can finally breathe a sigh of relief! Last minute cancellations are never good, but sometimes, they end up helping someone else