I don't know if this is actually just a side effect and I'm being an idiot, or if smoking it brought out a latent symptom of it, but I may have had something similar.
My first time smoking weed, I was trying to be Mr. Big Tough Badass and not pacing myself. I chiefed an entire joint of Blue Dream, pretty potent strain and not recommend for newbies.
About an hour in, and I was in hell. I was utterly convinced that my entire life up to that point was a hallucination I had conjured to cope, an escapist fantasy and the real me was in a mental institution. I was 100% convinced of this. I kept begging my friends to convince me that they were real, that I was real. I was terrified.
I slept it off eventually, but those feelings persisted a good three weeks after. I hadn't smoked any more green in that period, no alcohol or any other substance.
I had read accounts that "greening out" on weed can lead to feelings of depersonalization, and it sounded very similar to what I was feeling, especially how long those feelings lingered after the high wore off.
I don't know if that's what you're looking for, but that's my story.