I've had experiences of dissociation that feel exactly like you describe, and if I do it today, it feels very much like that.

In the past, when it was much worse, I'd just all of a sudden be somewhere with huge chunks of time 'missing'. Like, I'd be walking down a street with no recollection of how I got there and just head home, or I'd wake up with days missing and just get up and go about my business.

Weirdly, when I was blanking out like that, I didn't worry about it. I didn't think, "Wow how come I don't remember how I got here?" because I think the blanking out is protective. SOME part of me knew but kept it away and I was fine with that.

When some of that 'blanked out' material started coming back, it felt like a hallucination--like I was watching a nightmare with me as the star only I was awake. It took a long time to believe it was really me remembering bad experiences about ME--it felt like some other life.

I think everyone dissociates sometimes, but not everyone ends up having problems with dissociation, if that makes any sense. Really it's a protective mechanism that becomes unhelpful later in life, that's the way I see it. Good luck to you! It does get better.