Wednesday is only a few days away. If they don't have cancellations, that isn't personal; it's just fact. The office people are just doing their job. You therapist/pdoc is the person who you will sit down with and talk to about this, and I suspect he cares since he has taken the time to figure you out, he's called the crisis unit when he was worried about your welfare.

Resist the default reaction to run away. It's a pretty common reaction for you (and ties to your diagnosis that you are disputing btw).