I've read about derealization before, but I've only experienced it mildly before (occasionally feeling "off" and spacing out) but I've been having really intense episodes recently. 
When I'm not focused on a task, I feel very, very strange. It feels like the world zooms out and I'm very far away from everything around me. I also feel both very jittery and spacy at the same time. The world seems like a dream, or like I'm viewing it from space.
And occasionally, I'll look at the people or just general scenery around me and have an almost "ah-ha" moment where suddenly everything feels extremely unreal and foreign. It's like when you stare at a word too long and all of a sudden it doesn't make sense, it's just a jumble of symbols. 
I was lying in bed the other night and out of nowhere I felt like some veil was lifted, and that my life and my loved ones were just fake, or like I was completely detached from them. I can't really describe it well, but it made me feel so bad I wanted to die. It just gave me a feeling of complete despair.
Anyways, I keep experiencing this lately. I get that zooming-out feeling and all of a sudden nothing's real. It's fucking awful and I don't know what to do about it besides vent here.