Have you heard of dissociation?

I mean if you went to a doctor and told them "things don't feel real sometimes" they'd just say "you have dissociation/derealization/depersonalization". Doctors aren't magical beings with some magical power of diagnosis, they just go off what you tell them. Also, no matter what label you give it, that just obscures the real question, which is "does this negatively impact my life?" If yes then look for a way to treat it. If no then don't worry about it