Does any else gain knowledge from their "Hallucinations" as in hallucinatory knowledge.

I was reading a book called the cosmic serpent by Jeremy narby and it discussed how the native shamans gain all their botanical knowledge of which plants heal and cure you from their hallucinations,that pharmaceutical companies later use.

my hallucinations/visions are fractured and alternating but as real as anything else you've ever seen in your daily life.when I was given pills to stop the hallucinations I dreamt days later that my "vision had been murdered"

hallucinatory knowledge is the wonderful idea that hallucinations have value and knowing,that there are other forms and ways of accessing knowledge.I've learnt hundreds of things from my episodes,knowledge about all manner of mysterious things will come to me in a tumbling way that doesn't fit in a tidy western frame or order,knowledge of the deep ancient past,knowledge from mythology,all sorts of weird iconography,symbolism and little secrets of the world ,come like they do for the shaman.

It's only in western culture that I'm a schizophrenic in my great grandmothers line I'm just an amiqurra (shamaness) I gain knowledge a different way through dreams and visions.

Why do we assume knowledge can only be gained from traditional alphabetic literacy that relys strongly on the left hemisphere of the brain only instead of the right,in the form of structured books and systemised science.

To give you a little example of what I mean I dreamt maybe nine years ago that I was in an isolated German village I was told that if I caught the plane back into time I'd be in Poland - the notion was that I was German but my deeper roots were polish ,I got this knowledge by having a sleep.

Six years later I took a DNA test - my results were overwhelmingly polish I had markers and repeats(DNA code) only found in polish populations this same knowledge required and relied on decades of funding,science and molecular biology.

two very different roads to exactly the same conclusion,can other things be gained from this second road.

Do you ever gain wisdom or knowledge from your visions as scary as they can be?