I totally agree with the other posters. It sounds like "de-realization" or "de-personalization", part of the spectrum of "dissociative disorders. Please talk with your Pdoc (psychiatrist) or/and therapist if you have either. If you don't have either, please do seek medical advice !

I have had these experiences before and they can really be stumbling blocks to feeling healthy and grounded. Take care !

Shalom