What do psychedelics do? Good question. There is a neurological answer, a phenomenological answer and a metaphysical answer. The neurological answer has to do with the 2A receptor in the brain. The phenomenological answer has to do with visuals and visions. Here I will give a metaphysical answer.
Psychedelics open the channels between transcendent Parashiva, beyond all horizons, and immediately given conscious awareness, Shiva. Shiva comes from Parashiva (the Son is from the Father), but under the influence of psychedelics, it comes trailing clouds of glory.
The influx of spiritual energy (for want of a better term) from the infinite wellspring of life and light that is the Godhead (Parashiva) charges the consciousness of the shaman (Shiva) to such a pitch of intensity that every object of awareness (Shakti) is charged with the grandeur of God.
Thus Shakti is received by Shiva in wonder, awe and beauty, and with a sense of inexhaustible sacredness. All things disclose the Holy Spirit, and are revealed as profoundly numinous and holy.
Alternatively, the influx of spiritual energy fails to find its way from Parashiva to Shiva and Shakti, but is diverted and hijacked by the ego, the psychological mental construct we call our “self”. In which case, the super-charged, hyper-active ego produces a plethora of confused thoughts and feelings, sometimes resulting in hallucinations, fantasies, delusions, anxieties and paranoia.
If you can put your ego to one side, and get out of your own way, then, and only then, will psychedelics do what they were sent to do – sanctify you and the world.