I don't have much input that hasn't already been said by Axiom. I'm not quite sure what you mean by images overlaying but to contrast to what I have had in the way of visual hallucinations, I saw what you would call illusions which were objects appearing to almost move out the corner of my eye or objects standing out more than their surroundings. I've had depersonalization before to mild extent whilst on ketamine once & that was like seeing the world but from a third-person perspective almost. Quite different experiences although of course you might get other types of dissociation.

Perhaps you could post in the Dissociative Disorders section of PC & see what they have to say.

Who knows you might get more people who can relate to you there. It's worth a shot if you don't have the means to see a psychiatrist at the moment although that would seem the best course of action.