Do you know if you feel more relief or regret? It may help to see if one of the feelings is more "true" than another, and forgive the one that isn't. In a situation like that, I imagine I'd probably feel relief, but also beat myself up and feel guilty about running away. But you're allowed to run away sometimes, and I try (though I usually fail) to reason with guilt.

If a time slot is open, it's there for the taking. And changing your mind wouldn't be any more wishy-washy than if you'd canceled due to a stomach bug but felt better sooner than expected.

I haven't had to cancel an appt yet, though I've been tempted a couple of times when I was angry at my T. I just have this fear/longing that if I cancel even one appointment, I would be unlikely to call back and ever reschedule, and then I'd never go back or try again, and just be on my own from now on. Which is one of those disgustingly attractive, romantically desperate and hopeless fantasies. :/