Hi! It sounds so much like derealism to me, or at least closely related. Hallucinations is when the sub-conscious images are seeable in the consciousness.

Derealism isn't a hallucination, it's a disorder.

I can be just fine, then everything changes to unreality. Things that I know are real, but aren't real according to what I know and see. It's like looking at everything that I've looked at forever and now it's existence is fresh, new, and foreign.

It's like entering a bubble and life as I know it is not. All I can do is sit and wait till it passes, or do some grounding techniques to bring me back in touch with reality.

It's so totally weird, but I've learned that it's a free ride to the incredibly unreal that it doesn't bother me at all. I hope that this helps you!