Oh Lord Tree what a week. Although, I have to say (and this is probably my therapyish psych-student brain talking) I think your T's reciept mistake was just what you needed. This is what I'm thinking:

He was the one who triggered you at the beginning of the week, essentially the one who caused your turmoil (although you could say it was also your core issues coming into play) but he didn't realize it at all...you sat with your pain and shame alone without him having a clue as to what he did until he got your message and read your email.

However, with him making this mistake writing the wrong client's name on your receipt, he was sitting with his shame and embarrassment when you didn't even know it. He got a chance to experience a piece of what you were feeling, and wondering where those feelings were coming from. It was his turn to feel his actions the guilt that came with it.

I think maybe you needed him to feel a bit of what you felt, realize that he makes mistakes that affect him as well. It means a lot that he wanted to connect by phone also. You mean a lot to your T, Tree. Most people would kill to have a T like yours. There are times like this week when you went in for an extra session and he didn't charge you and today when he called and left a message appologizing a thousand times, that really show what a deep connection the two of you have. I'm very lucky to have a T like that also, but some people don't get that gift, and we have to remind ourselves in times of disconnect, disapointment, or ruptures, that there are times like this that show us what we REALLY have.

Hope you have a great weekend...you need to do something for yourself now