Hi trailrunner, I like what Luce said about a part peeking out and being disoriented because of the time lapse and change in chair. Maybe it's not so much what you had been discussing with your therapist a year ago, so much as what had been happening just prior to feeling off during this recent session. Something triggered the part to come forward, either at the beginning of session o just prior (if you entered his office feeling off). At least, that's how my therapist approaches things--identifying triggers for each one of us, working with that triggering material, and finding ways to calm the one that's come forward. But if it feels like knowing what you were talking about a year ago in your therapist's office will help, then go that route. It may turn out to be the same trigger and will confirm things. (I hope this makes sense--if not, disregard.)