Hangingon,

You did the right thing, I know if feels scary right now, but what you did shows a lot of courage. In all the 4 years I have been in therapy with 3 different T's, not one has ever canceled last minute. In fact one time one canceled several days before, because he was in the hospital.
Your T's actions are unacceptable for her profession. Maybe something is going on in her life, but that shouldn't interfere with your therapy. Have you thought about looking for another T? I am sorry you are getting so hurt by your T, they are suppose to help us feel better, not make us worse.