I came across this article today about how a man went into an intensive meditation retreat and ended up being treated for psychosis after having quite an extreme reaction. It’s interesting because the article does its best to explore the difference between various stages of the meditative experience — ‘Arising And Passing Away’ stage vs ‘Dark Night’ stage — and features short interview sections with various authors who have written about the boundaries of meditative experience and psychosis.
It puts me in mind of a story I had heard about how Zen monasteries treat monks who have these kinds of experiences, which was by having a hut out in the forest where those monks could stay in isolation and silence, and were not allowed to talk to those who brought them their food.
It is a difficult situation, because there is no good solution. Sometimes the right response to these kind of reactions to meditation is prolonged hospitalisation, and that is something that Buddhist teachers running a resort cannot provide.