Do a search on "derealization"
And "depersonalization"

They should shed some light of what you are experiencing.
I have similar things happen to me. As far back as I can remember.
A could weeks ago I got lost walking a route I follow almost daily. It only lasted a few minuets, but nothing was familiar. I didn't freak because I have weird experiences frequently. I wait and "reality test" honestly it wasn't as bad some of the others.
Sometimes they come with a funny sensation or taste on the back of my tongue.