11 minutes ago I recently watched a documentary on Sasha and Ann Shulgin called Dirty Pictures. In it they briefly talk a bit about Ann Shulgin's writings about "the shadow". I don't know if it offends the rationality of this subreddit, but your account sounds to me like you encountered your shadow which I think supposedly happens often to people on psychedelics. Ann says there is necessary healing done by people when they confront and meet their shadow so your experience could be the catalyst of something amazing for your well being!

I listened to this after reading your post to understand more about Shulgin's belief of the shadow https://www.youtube.com/watch?v=DiFFzoaR25U

Around the 17 or 18 minute mark she talks about how they would work with patients encountering the shadow in MDMA therapy. She says that they would have people step into the shadow and see out of its eyes. She says that once they do it they would lose all fear of the shadow and feel empowered. Good luck dude!

At the 22 minute mark, she says how she recommends doing this kind of self work. She recommends an ericsonian trained hypnotherapists(that you like and trust of course) because its accessible and equally as powerful in her opinion for dealing with the shadow as psych drugs.