Presumably you will feel upset/angry/glad/worried/anxious/

http://www.psychpage.com/learning/li.../feelings.html

about this being the last session before your T goes on vacation or about the week your T will be on vacation and your ability to cope or about what someone said or did to you ten minutes ago/at work/at home, etc.

You think and feel, look inside yourself to see exactly what, and respond to that by sharing with your T and elaborating or discussing whatever you come up with and then taking in her response and processing that, etc., back and forth.