So for maybe, 2 years or so?, I've had this strangest thing where I would just completely space out. It's only for the briefest moments, though. I had it today, I was in class listening to my teacher lecture, that's when I felt like I was floating and I couldn't control anything. It just sort of hits me at random. Also, there is always this light pressure on my forehead whenever this happens. I do not do drugs, but I did have OCD, but it's slowly fading out..

Would this be derealization? Any feedback?