Not some exogenous event or mystical miracle or whatever it was just pure chemistry and electricity.

This awareness is technically called "insight", as in "insight into the weirdness of your beliefs". Generally, people suffering from psychosis don't have insight. They genuinely believe they're experiencing real things. So in this way at least it seems like you're healthy.

That being said, there's a wide range of psychotic episodes, and feelings of uniqueness, specialness, or being chosen aren't always present.

And talking donkeys if you're Muhammad! https://en.wikipedia.org/wiki/Ya%CA%BDf%C5%ABr

Could be their affinity for strong weed.

The brain is more complex than a mere mental condition which we still don’t fully understand.

But on your larger point about fuzzy diagnoses I agree with you. In my experience, diseases like schizophrenia are better understood as a large number of unique diseases under a single heading. Saying "I have schizophrenia" is like saying "I own a dog". While an accurate statement, there are many different kinds of dogs, and their behavior varies widely. Schizophrenia is the same.

If you've spent time with groups of people with schizophrenia, you'll see that there's an extremely wide range of outcomes. I think the wide range of outcomes may be explained by there being a number of different diseases.