I have been in the situation where I was confused about something that happened, or that my T did, said, or implied, and my mind just would not let go of it. Very stressful so (((LH))).

What I am sometimes able to do is flip my obsession from the negative assumption to a positive one. I will assume that my T did not intend for me to be upset/confused/feel abandoned/whatever. Then I used my obsessive thinking to find all the evidence provided in our sessions that supports the position. I'm my case I tend to be amazed at all the little things I find that support the position that my T is competent, caring, and does not deliberately (or at least not maliciously) send my mind into meltdown mode.

(((LH))) Hang in there, his vacation will end, he will return, and you will have a chance to get the answers you need.