I'm not sure if I've had these exact experiences, but something related perhaps, albeit milder. When I was in my early twenties I consumed a lot of cannabis in the form of hash cakes one night and it triggered a panic attack. What was scary about the panic attack was this feeling of the world around me feeling dreamlike, or like I was in a dream I couldn't wake up from. It was like there's normally this safe ground we all walk on, and we don't know its even there, and that implicit feeling we all carry with us can drift away. It wasn't psychosis, I think it was just a by-product of anxiety, which in itself is a very mind altering experience. If you've ever had a panic attack or experienced severe anxiety states you'll know what I mean. It's effectively a bad trip, your perception is altered by the cortisol and adrenaline coursing through your brain and the resulting mental exhaustion and depressed emotions that can arise alongside it.

I was predisposed to anxiety already, and I think this experience led me into developing mild to moderate panic disorder which was driven by fear of experiencing this state again. So it become a vicious circle. A fear of fear which, ironically, became a trigger for the feared thing. I believe it was made worse by my highly philosophical brain, and a deep immersion in existential philosophies. In particular Buddhism. So I was already used to a worldview which was challenging existentially let's say. Looking back, I was probably too young at the time, and maybe too anxious, to be immersed in all this naval gazing given my mental health.

Decades later I'm OK, but I have residual panic feelings surfacing sometimes. The difference now is that I don't identify with them, I just see them as fleeting feelings producing a distorted sense of reality. The secret with anxiety, for me at least, is to not care if you feel anxious and to let it pass.