VERY strange sensations and feeling during treatment for Anxiety

Hi, a little bit of history first.

I have been suffering from social anxiety for about 4 years now, along with several other mental health issues which I myself can only label as ocd/general anxiety/thought disorder , for which I am now recieving psychotherapy. I always feel 'out of it' almost like im dreaming and nothing feels like its made of reality. I find it hard to hold conversations with certain people e.g people in the work place/senior people. I feel like I am contantly being judged by everyone I see and panic or sometimes go red and start to sweat buckets just when people make eye contact.

During todays session while the psychotherapist was analysing and breaking down some of my earlier thoughts the room suddenly started to feel like it was getting smaller, the therapist felt like he was further away and everything seemed to slow down. Everything felt like it was in tunnel vision (or what I would assume tunel vision is like). It felt almost like I was in some sort of sub concious.This freaked me out at first and my heart was really racing, I have never felt weird like that before and am still thinking what happened? Afterwards I still feel slightly odd and maybe a bit depressed for some reason. Could this be perhaps part of the healing process and the brain putting things back into place so to speak? I think I might be feeling slightly better overall but this might just be placebo..any help from anyone what this could be?