I think I can relate to you, albeit it is impossible to say really since I can't really put it into proper terms either. I can't really describe it without sounding pretentious, even though this isn't the case at all, if anything it has been a very humbling experience. By now I can at best describe it as a feeling of depersonalization, it seems to me in retrospective, as if I was able to experience existence with a lack of personal involvement, and as such neither thoughts nor emotions really dominated this condition, it felt more as if anything was involved, yet did not have a real effect on me to the degree where it would distort my comprehension of the moment. I suppose it might have been similar to the Buddhist concept of an epiphany, but I do not have intricate knowledge of Buddhism, and as already said, it's difficult to put it into words, so that might be completely false.
I've tried LSD years later, and it wasn't really the same, granted I'm not some seeker fag that takes hero doses, so there's that part I can't attest to, but it was very much different for me. LSD merely distorted my mind and made me incredibly susceptible to my emotions, which is a very interesting feeling, but not the same as what I've described above. However I don't consider Psychedelics by themselves to be a real tool to gain deeper philosophical insight, but in my experience they can be helpful to gain a better understanding of ones own mode of thought.