Certainly could be a "rare form of schizophrenia" (although I have not heard of such a thing, that is no reason to assume it doesn't exist).
Or.....it could be a VERY COMMON form of Obsessional Anxiety Disorder with dissociative and somatic symptoms. This VERY COMMON type of disorder will include feelings of unreality, delusional thoughts of paranoia and powerful obsessions. The person may also have all kinds of "odd" physical sensations, sensory disturbances, (visual, auditory, etc.). And if on top of this common problem, the poor person in question also had used a rec drug prior to all this happening to their mind, it makes PERFECT sense that the person is also under a kind of "post-trauma" response on top of the rest of this horror.
Could it be "a rare form" of schizophrenia? Sure. It could also be a rare form of early menopause. Or a rare form of flu. Or a rare form of muscular dystrophy. ANYthing could be "a rare form of" anything.
But why would we assume anything is a "rare form of..." some serious condition when the symptoms all point to a COMMON problem that falls neatly into the Anxiety and dissociative arena.
Doctors make very odd choices sometimes.
Get a second opinion.
I just have no words, lol....truly. no words