I spent the better part of 20 years in theological and occult research. I'm, what you might say, "touched," in that aspect. I had such kinds of experiences before I ever started drugs.
The part nobody ever explains to you about your shadow work is that it's important that you do it because it helps you learn that even the negative aspects come from inside you, they just come from a part of yourself you've yet to fully explore and understand. It's a bit like fumbling around in a cluttered closet in the dark...you smack into things and quickly realize you need a light on so you start trying to feel out where the lightswitch is.
Get the light on, that's the first step. Gotta see what you're working with. E.g. Acknowledgement, and Acceptance.
The next part is the part where you start reorganizing.
Well, you can't reorganize a mess in a messy area, so you have to compartmentalize, temporarily extracting things so that you have room and space to organize and put them back accordingly.
This is true both of your inner self but is also true of learning how to understand your trigger points better, learning what to avoid and what to welcome, and so on and so forth. The experience is different for everybody but the process is usually relatively around the same.
Drugs which introduce you to spiritual experiences are the tip of the iceberg.
You don't actually need them at all, you CAN do this sober, but it takes a lot of time and practice and developmental psychological and perhaps even physical endurance if you're the type to trust in Mind-Body Connectivity, which is essentially what Yoga is. And without Yoga specifically one can acquire that same state just by doing any other sorts of a physical workout. The destination is the same, the vehicle of which people take to get there is the part that can be freely different.
Just always remember to be safe during these things if you're taking drugs for it. Don't equate your dosage level to your experience because they are not the same. What matters is what you get out of the experience itself.
I'd say acid makes the experience a lot prettier for me, but I can't say that because acid makes everything a lot prettier for me.