It sounds a bit like it. When I first had depersonalization/derealization, I had some feelings that were like that. The primary unsettling feeling was that life wasn't real, and my body wasn't mine. I suppose you could say it was like I was in a video game. In addition, everything around me lost meaning - music was an unsettling jumble of sounds, colors looked flat and meaningless, human faces looked strange and unfamiliar, and my home no longer felt safe. Emotions, words, and life itself no longer meant anything. When I looked at the mirror, I didn't feel like my body was actually mine. It truly makes you feel like you're dreaming, or watching as someone else lives your life. I did often have foggy, almost lightheaded feelings as well. It felt like my senses were behind a sheet of glass. Weird comparison, I know. Maybe you've felt some of these things as well.
It did mostly go away eventually. I've read that it usually doesn't stay forever. I still get it sometimes, though. The main thing I struggle with now is that I often feel incredibly weird and out of place. I just feel like I don't belong in this reality. I also occasionally have something I like suddenly lose meaning, which is irritating.