My first experience with DMT was similar but not the same. I was taking changa, and words of Terence Mckenna "you gotta take that third hit", were in my mind. So my wife, as directed, put the bowl under my mouth just as I was drifting out from the room which was changing colors and "all the air was sucked out". That third hit initiated the blast off which included highly colored geometrical imagery, that as the "high pitch sound" became louder started forming 3D/5D/"unknowable D"
dimension, beautifuly colored, highly detailed - mandala like portal.
In retrospect, it was like I was going (whatever that I is/was) through some kind of "device" that was stripping me off of my ego baggage. So first I lost sense of out/in, then time went out the door, then I was not at any place anymore, than (all in a matter of a minute) language was strippef off and whatever was left was catapulted through that multidimensional, highly colored, beautifuly detailed mandala like object.
I do not remember what was my first experience, as it was few years ago, but I remember that I was going through several worlds which were so different that as I entered one the last one was ineffable. How to speak of the world where up and down do not exist, concept of time was never forged, and meaning is created from other "stuff" that can not even be imagined in "our world"? Words just stop being of use. Even the experience is so different from world to world that when I was taken to another "pattern of reality" the previous had no cognitive bases to relate or stick in memory. My wife told me that I was smiling the whole time. She said that it was obvious I was enjoying what I was experiencing, while sitting with my back well rested on the sofa.
Last scene I dimly remember - I was looking at some object that was like a camera film and when i "touched" (with my "mind") a "part" of it, answers about the topic I touched up on unraveled with full 3D experience which I could zoom in and out to see the details of the theme at hand.
Last scene of this great ordered mess was that film roles were beginning to be a real film roles and they started to fall apart. As they were falling I was falling. At that moment I had my first thought , as we regularly think of thought, and it was - "Am I dying?". I was scared for a moment. But a moment later it was clear that I was actually being put back together into my ego and that experience was over. Well, I was in the visual world of Alex Grey but that seemed quite normal in context. Few more minutes and whole reality was once again like it was 15-20 minutes before I light it on fire.
My conclusion is that once I got beyond "the portal" in the beginning the reality's that I was traveling through were so different that experiencing one reality meant you have to totally disolve previous one as physics were not compatable. When I was in one of those worlds it all made sense, but I could not breach the gap from world to world so "I" forgot one world immediately as other appeared. There was no sense of continuity or even of similarity between several worlds I visited so there was no possibility of rememberance. Only stages I remember was dissolving (beginning) and reassembling (ending).
Sorry for the long reply, I just wanted to convey the message that "not remembering does not equal not experiencing". I do not remember most of the experience I wrote about, but I obviously enjoyed it, as my wife, who watched me the whole time, told me afterwards.
DMT is one potent substance and I would like to have an extended, Ayahuasca experience. This short experiences are great to shake you up, but I would rather have the psilocybin at 5-8 grams a dose and have similar experience lasting 4-5 hours. Psilocybin, in the doses mentioned, took me to similar places, but it had stages/levels so I could get more out of it and incorporate much more into my daily life. But yes, DMT can make experience so impressive that you do not even remember them