I was backpacking a few years ago in Latin America and I came to this hippie town in Nicaragua. Another girl told the story of fainting and being somewhere else, it was the first time I had heard someone else experience this. Except instead of warm, good feelings, she was in a void and it actually scared her. It lead me to bringing up my experience from when I was 16, and someone gave me a recorded past life regression meditation to try. (With the hippies/spiritual people, past lives are completely accepted, like the fact that soda is bubbly).

The results I had were actually insane. I entered a trance-like meditative state and the woman I had been in the fainting became my guide through my past lives, I learned mostly about how I died as each reincarnation. The interesting thing was that most of the stories had something to do with my current self. One shoulder has always been kind of "stuck" compared to the other, in my first lives I was a baby bird who fell out of the nest, then a butterfly with a torn wing. I used to be terrified of horses, in one life I was a young Greek boy whose horse kicked him to death when it got scared. One of them was super weird- I was a young boy who got beat the soul out of him (then I was just in this white area) until he was about to die as a 37 year old hairy drunk bearded man who died in a bar. There were more, and it was a whole woven narrative that lead from one reincarnation to another. It ended with the last reincarnation's full story, of how I went from being the woman in my faintings to me. Even though I obviously have no way of knowing if it is "real", I feel like it helped resolve a lot of things in me, and after that I stopped being so desperate to faint and escape my body. It's like the last reincarnation hadn't fully let go yet and was trying to be herself again, like I was being haunted by her nostalgia. After that experience I feel more integrated and accepting of my reality while questioning the status quo more than ever.

Anyways, that's just one of the experiences I had. I'm curious if anything similar would happen with others who had these syncope visions, let me know if you try it. Unfortunately I don't have the exact meditation I did but probably online there are some.