Hi Susan I'm not a pro, but I have gotten this too. Specifically when I did EMDR with a therapist and re-lived some trauma - probably all of it, and became very despondent, like a trance/daydreaming - but it was worse. My expressions can be blank, and not only until last year at a rehab, did a therpaist make that comment to me. I had to be stoic in my family growing up because my father was a raging alcoholic and the environment was unpredictable, and quite scary. I learned to practice "staying in the moment" Mindfulness, as somene said, is quite similar, or for me, not easy. I tend to daydream and go into a daze and reminisce about not so pleasant things. I held in my feelings of sadness for a long time - sometimes behind rage and anger, but now when I feel anxious - it means I need to cry, and when I am able to, I feel better. I have to be on meds for this stuff, (anxiety) because I haven't learned to handle it yet - I was getting there, but came back to live in the same environment it started from, I made a poor choice.

Not sure if this helped, but it's all I have that can help to relate.