I struggle with this too. Sometimes Im aware Im dissociating - Like I am watching through my eyes, and I'm thinking, but I have no control over my body or what I say.

But mostly, I realise afterwards. Like last night - Friday, I was thinking about Tuesdays T session, and it was only then that I realised I dissociated most of the session. I remember feeling a pain, looking at my T hoping he didn't notice, and then nothing. I can't recall anything after that point until Im half way home. I don't understand why it took three days for me to realise I don't remember half the session. Its so weird, as I really haven no train of thought other than the sessions! But this is the stuff Im picking up on now more and more often. I think Ive dissociated through most of my life, and Im only just learning that, and how to recognise it.