I've had a similar feeling while on psylocibin mushrooms...it's said that DMT and whatever's in mushrooms is pretty similar, so I have a feeling of what Aya has described.
There was a feeling of complete bliss, of complete oneness with everything, to such an extent that I actually began having a mental connection with some benevolent power...it felt like a friend I knew for a long, long time. We began to laugh uncontrollably from some stupid little joke we had played on eachother in a past life, though I can't exactly remember just what it was. But as we were laughing, I turned around to make a face at my friend...but guess what? No one was there! Not even my physical friends were there...there was no one, and here I was sitting in an empty room for what must've been a half an hour talking with some imaterial being!
That tripped me out. I found my friends laughing in another room, and I told them what happened...they just looked at me and started laughing.
Laughing and humour is the most powerful medicine on the face of this planet, probably even the universe.
I've done mushrooms after that but with never that same effect. That was my first time doing it, and the other times have never reached that feeling...in fact afterwards, they just made my body feel weird and alien, with only "bulging-contracting" halucinations.
Despite my last uncomfortable experiences with mushrooms, I would definitely undergo an ayahuasca ceremony. Done in the right setting, it can be an awesome experience, one full of revelation and understanding about the nature of things and humanity, to put it simply. But nothing can truly describe the strengething that occurs within the initiate, the healing in the positive experiences, and the tempering of the sword in the "uncomfortable" experiences. Either way, one comes out of these experiences changed, and hopefully, in such a way that will help them discover their true "goal" in this life.
"Don't eat any wooden nickels."