Just hang on man and take it easy, remember that this can be part of tripping as well: usually first you desintegrate and then you (re)integrate again. You are not alone in this, I have had a very similar experience only it was
with mushrooms. My second time was devastating. It takes time to pick up the pieces, but the most important thing is you regain trust and faith again and learn to relax and surrender to what happens. Know that we are always in a process and what seems to be triggered with some people, especially if you take it too far too fast, is a much deeper and faster process relating to your sense of self and what that means in the world.
Allow yourself space and time, if you must then forget about reponsibilities for a while since it sounds like you have other top priorities right now: straightening yourself out and resting. Live slowly now, do not try to despair or wish too much that everything will return to normal unrealistically fast. I know it is terrifying, if it's in any way how I experienced it. Yes this shit is more serious than everyday bullshit, but there is a path that leads from here: you can take the long way to reintegrate and fit together that you are both an individual, a separate person, but you are also deeply connected. Its very possible that the reason you are scared is because you have tasted extreme freedom. Freedom is underestimated, it comes with proportionally great
uncertainty but also
beautiful potential.
I hope you will take it from me that you can learn to see this in perspective if you allow it time, and seek help with friends and family and guides if you feel you must. Seriously heavy duty trips don't immediately call for psych councelling unless you're really far gone, I'd be careful with that since at this point it's IMO not a bright idea to think along the lines of disorders or anything. It's much better to interpret this as a spiritual breakthrough and I guess breakdown. It's documented by Stanislav Grof (spiritual emergency), anyway...
None of that may mean anything to you right now so just let it go then, rely on just 'being' for a while and realize that there isn't any real thing to fear - you can feel really bad from confusion though. And that's when I return to my previous point: relax and take the time you need.
Please, be wary of taking more drugs to retrieve your way through the rabbit hole. At first I took nothing (when it happened to me), then I started taking mushrooms on a very regular basis and half of the time I went to hell and back. But it was the only way for me to relate to what happened. Remember a couple of things: if you are hit hard like this you are more fragile and you absolutely shouldn't take reasonably big doses of psychedelic drugs - preferably take none at all but if you must, go low. To retrieve what happened I do believe in engaging a psychedelic headspace again but in a MUCH MUCH more slow and controlled way that is therapeutic and that loosens things to put them back into place.
Your best bet by a long shot is finding a spiritual teacher who can give you advice on what you feel happened to you. Because IMO this is almost always in the spiritual realm and treating it differently can be harmful. This is not about religion but more like the connection between mysticism and psychology.
Different people react in different ways, get back to us and maybe reflect on how you feel but be careful not to wallow. Seek support with our The Dark Side forum if that seems suitable to you.
I didn't understand I was me anymore at the time, I also felt like I couldn't turn back and that I was in risk of insanity/death and that it was irreperable. Yet here I am, pieced together again by only myself. There is a drive in us to be whole, I believe that. Sometimes breaking something makes it easier to rearrange stuff and fit it back in a better way, the way it was meant to be all along. If you feel completely and utterly broken please read and understand what I am telling you: there is always a way