I've also used psychedelics from an early age and still continue to do so,but with much more knowledge or you could say with experience comes wisdom. I've been in loops quite a few times and the primordial fear of death is ever present when experiencing them. Loops seem to come when you're on the brink of ego death,so in your mind you believe you're going to die or have died.
I've had it where I've felt my body being blown to smithereens and my atoms are everywhere. I thought there must have been a nuclear war and only just realized I was at ground zero...I was vaporized inside out and this looped over and over. I had another where I realized I must have really fucked on arylcyclohexylamines and that my body had become like a vegetable and I was trapped inside not able to communicate. I could even hear the life support machines beeping away and family members trying to talk to me and crying and this went on for eternity.
I stopped smoking cannabis for years and started up again after these loop experiences,at first in small doses I was okay,but then after upping the dose I started hearing voices when going to sleep. It was like a radio being tuned into the frequency of people I knew. I could hear their voices as clear as anything,friends or family and they were always putting me down saying I was a freak and worse,really bad stuff. I started to think maybe I'd become psychic in some way even though part of my brain knew it was psychosis. It stopped when I stopped smoking cannabis,if I have a small amount I'm okay,but if I consume more I become paranoid and cant escape the intrusive thoughts.
My nephew smokes lots of cannabis and says he's never experienced anything like it,but then he's never done psychedelics so it was his conclusion that taking psychedelics increases the risk of psychosis. I concur.
If you leave it alone then you will get back to normality or as normal as can be,once through the door you're never the same. You will grow in time and if you can you will use these experiences as lessons and it will make you a better person.
If you feel that the psychosis is not going away or that you cant wait to process the experience and that you're suffering then I recommend a short course of antipsychotics. Quetiapine is very good,but turns you into a zombie for a while.
After my experiences I'm fine. I've grown, learnt and become aware of the intricate process of psychedelics and aware of my ego. Your mind is all powerful and can create whatever it wants,if you create it you can undo it...Its all an illusion,when you've realised this then you can see what it really is.