I need help fully understanding it. I have had Derealization and Depersonalization issues in the past, although it doesn't happen often there have been times where I was talking to someone (in the case I am thinking of, my therapist) and she was talking and I was staring at the door, all of the sudden I could feel like I was being detached from myself and then I was in a 3rd person sort of view where I could see myself and my therapist but I couldn't really get what she was saying.

When I was in school I would always zone out, sort of day dream and not realize it for minutes and sometimes when I am talking to someone I feel detached again but like from my own ears/brain and I can hear what they are saying and understand but its like it goes in one ear and out the other and I can only remember it for a few seconds. I get deja vu feelings all the time even if I have never been in a place etc. can someone help me?