General Anesthetic, I've been there. The experience of joining with everything, stepping back and seeing the indescribably complex construction of reality, and then finding out that at the core, everything is actually nothing, is terrifying. I've posted the link to my own experience that was like that, and I don't know if you've read it, but here it is in case:
http://www.erowid.org/experiences/exp.php?ID=48983
It's been a while since I had this experience. The last (and only other) +4 I've had was with mushrooms, and that experience left me with a profound sense of bliss and understanding of, among many other things, what will happen to me when I die. Well, me as I know him will no longer exist, but I mean what will happen to my soul. 2C-E took this notion, which I had started to take for granted, and shattered it when I experienced nonbeing. I'm still trying to integrate this, and it really shook me to my core and made me feel far less sure about what I had previously known. If it helps any, I've come to the conclusion that what 2C-E shows you is a level beyond that which any other ego-destroying entheogen shows. To clarify, mushrooms, for example, show us the life-force, or god-force, or whatever you want to call it, of this existence, and you can merge with it, and realize that in fact we are all one and the same, and that our sense of self is just this force's attempt at gaining new experiences. 2C-E, however, can bring us beyond that point, to an even infinitely larger entity of which our god-force is just a subset of. I believe that with 2C-E I was taken beyond the realm of collective consciousness, into a cold, silent, and literally timeless place that may to our collective god-force as that god-force is to each individual identity (person). The reason I say this is because I distinctly experienced the reality that we exist in deconstructing, and I could see it at every level, in fact, so much so that I was conscious of how every tiny little thing was all set in place in order to create reality. I thentranscended that state, and I believe (currently) that I went to a place between realities. Egads, the pattern just gets bigger and bigger and bigger...
And also, I completely agree with you about the seriousmess of 2C-E. I also was very, very sure that if I had been fully swept away, "I" would have never come back. 2C-E is not to be trifled with and is, in a way, the most powerful psychedelic tool that I've ever encountered. it is driven by cold, impersonal, irrevocable logic, and if you mess around with it, it can and will quite literally destroy you.
So also keep in mind that I realize these thoughts are disjointed, and I apologize in advance if what I'm saying is unclear or hard to understand. As I said, I'm still working every day to integrate what my last 2C-E experience showed me, and even the act of wqriting this has given me a new idea or two. I'm afraid to back. But I also feel that I have to in order to better understand what 2C-E has to show us, because it just feels so cosmically significant in a way that nothing else has ever touched on.
I'd love to hear some thoughts and other ideas from people who have reached this state with 2C-E before. There's a lot to understand in the effects of this tiny molecule, and combining all of our thoughts can only help to make it more clear.
Also, General Anthesethic, I'd love to know how similar the state you reached was to the one I reached in my report. If you have time, could you take a look at it and comment? I've read a number of reports that had many similarities to mine, but most people seem to experience something infinitely less intense and significant than what I, and also seemingly you, have reached.