Anybody's brain can react the way yours did to stress; many brains are less able to handle stress; stress comes in many forms, including PTSD, drugs, alcohol, anxiety, and even lack of sleep.
You shouldn't be taking Adderol without medical supervision and whoever is supervising you taking needs to be qualified to handle this.
Please realize Schizophrenia affects 1.1% of the American population, and that's just the general form, and that which is diagnosed. The real number is likely higher. It is neither an 'extreme diagnosis' nor is it that rare.
On margin, more people experience brief episodes of psychosis than who experience chronic psychotic illness, so again, you are just plain wrong.
the diagnosis of schizophrenia is a diagnosis of an extreme form of mental illness, regardless of its prevalence; cancer kills a lot of people, but it does so in an extreme form: the prevalence has nothing to do with the extremity.