Yep, sounds like a close to death expereince to me. I had a similar experience (yet very different) on LSD and nitrous (10 hits and a 50 lb tank all to my self!) I sat in my friends back yard and began to hear the voice of god (at the time I was a christian so it was god, now im a Buddhist, so who knows who it way, prolly just my own mind). This voice was speaking directly to my mind and was eminating from a bright ball of light in the sky (may have been the moon, but i was too tripped out to differentiate), the voice came on in a very powerful, thunderous, yet gentle way, using a language not of this dimension, it was direct, transcended normal communication.... i cant explain. I cried out and asked why I had such a cursed existance on this earth, why was I abused as a child, ect, ect.
Each time I took a hit of the nitrous I would go into a deep trance like state and the questions were answered. I then asked about the universe, and reality, and those questions were answered, in my minds eyes flashed diagrams of the universe and the mind,entire texts were revealed to me. As it progressed I wanted more. When I did too much nitrous my whole field of vision was filled with neon red glowing skull and crossbones, millions of them and a loud buzzer type sound, indicating that I was very close to death. Then it would fade, and the next question would be asked and answered. This went on for hours. Eventually I came out of it, a very changed young man.