(((hanginon)))
It sounds like one of those awful sessions where you and T just didn't connect AT ALL. I have had sessions like that and they are the worst. You wind up feeling in such a lonely and abandoned place. I have been with T for more than 2 years and he outright canceled only once when he was sick. A few other times he has asked if I could switch my appointment because he had something going on but it is not frequently at all. Consistency is very important in therapy. I think the bottom line here is do you want to continue with this T? It does sound like you are attached to her. Maybe after this week is over you two can come up with a plan for cancellations that is acceptable to you, and that you can work with. (Hey, I don't do email with T and don't have any contact with him when he is on vacation, so that part isn't unusual.)
Take gentle care.