I'd like to thank everybody for the incredible responses, I can agree with most of them.
To address some of it:
I like to think of myself as a generally healthy person, mentally and physically. I work a physically demanding job, live as honest a life as I know how to, and remain supportive of my children and ex-wife. I don't consume "addictive" substances regularly: I will have a drink a 2-3 times a month or take a few grams of kratom when I've had a particularly rough or painful week. I smoalk spice every now and then, but not with enough regularity to lead me to believe I should take a break. It's only been 5-6 times total over the course of several months, all but once sub-breakthrough. I live alone in a place I consider safe, with few reminders of any previous mental or emotional pains.
That being said, physically, I wouldn't expect my diet to be an item on anyone's self-improvement list, though I may be underweight instead of over. Mentally, my job and home life are pretty undemanding despite my supposed intelligence. Spiritually, I am not what people would call religious, and despite an interest in spiritual matters, I have never committed to a structured/consistent spiritual practice.
I have always recognized that psychedelics are not toys. I generally don't go in without hours or even days of serious consideration, which I suppose is my way of ensuring sound set and setting. They have always heightened my interest in spirituality, as I'm sure is common, and the experience prior to this one left me with the district impression that it was time to learn meditation.
Whether this demon was internal or external matters very little to me, fact being that I was grossly unprepared for whatever it was. I've had difficult psilocybin trips, but not of this intensity. Part of it seemed trying to convince me that I had no idea what I was getting myself into, what I was "playing" with, and I'd have to agree: I felt more defenseless than I ever imagined possible.
Lately I've been thinking that this is what fear does on a fundamental level, and what I experienced was the result of looking at fear through a metaphysical microscope with all else stripped away. It's difficult for me to admit or even sometimes determine what I may be afraid of, and how it was that I overcame fears as a child, whatever they may have been.