I’ve been experiencing this my whole life. I’m assuming mine is a milder version as it’s not as bad as many of these descriptions claim. It’s like you just can’t put the size of things in to any relative frame of reference. Everything seems really big and really small at the same time. I’ve never had any hallucinations associated with it. At least that I’ve noticed. But even though visually things look the same to me, the brain just can’t process how things relate to each other. It’s much worse when you get it at night when your eyes are closed. I always felt like watching TV helps.