I don't get angry when my T goes on vacation either. I found your comment about being different funny. I also thought that was abnormal for a while, like it was part of my "detachment" from others/defensiveness issue that prevented me from feeling upset. I kind of also wondered if I was strange because, I like the fact that my T has other patients.

During vacations, I struggle sometimes when there is an extended break, but I don't really think I get mad at her or feel like she is not going to return. Mostly the struggling was because I verbalize some thoughts, later didn't like what I had said, and desperately wanted to go back and amend it :-) I also had some trouble containing my therapy overflow between sessions so vacations were difficult. Writing and PC seemed to help a lot with that.

I'm not sure what approach my T uses specifically but vacations are treated with very little comment, "I'm not here in 2 weeks so when are your available the following week?"