My T did not discuss non-verbal communication as she pointed out that verbal is extremely difficult between two people. I think thinking one can interpret another's feelings with no input from the other can be very dangerous as we can't really know what is going on with another, especially since we'd have to base it on ourselves.

I would certainly discuss why you feel you shut down with T as you would get more information about yourself which is why I went to therapy, to get to know myself better and how better to use my thoughts and feelings to help me life my life as I desired.