I have a lot of derealization/ depersonalization, and I have for years!!! Yes, it's awful. I can be anywhere and slip into a dreamlike state. Like I'm not real.
I used to completely freak out.

You know what? I stopped freaking out. Now when it happens I just tell myself, "oh well, I'm having derealization again. Whatever." And I just roll with it until it goes away.

Look, some people have to buy drugs off the street to space out. But look at us. We can do it naturally. Next time it happens just relax and roll with it. Eventually, it will pass.