When I had ego death, I (if you can use that word) was sort of trapped/floating in space in the universe for an eternity, felt like billions of years. But there was no planets or stars, just a massive void, and my tiny speck of consciousness.

Finally, the void "burst"/exploded and the energy from it caused me to feel "pain" the likes of which I can't even describe. It was like being hit with a laser beam that tore every atom in your being apart.

When I did, I realized it was the birth/creation of the universe, the "Big Bang" (except it's not one bang, it's a never-ending cycle) and I woke up in my bed.

I once experienced existing in multiple points in history as multiple people (no clue who they were) of all ages/ethnicities/gender simultaneously.

The other ones are things that felt related to various religions, except I wasn't aware of what they were until afterwards. But I have never been exposed to religion, and don't have any beliefs.

There are two that stand out to me.

1. I had an experience where my partner at the time, it felt like we were the same being. Two sides of the same coin. This experience wasn't going so well, and I was trapped in bed (not physically restrained, just that I couldn't get myself to move).

And the gist of it was that, I was trapped in time and forced into a choice, and it was to either let myself die and stay there eternally, or create the universe.

The theme was essentially this two-sided entity that wanted to create and then experience the universe to entertain itself, but in doing so would also unleash all the pain that would ever exist.

Later on I wound up running across the concept of the "Demiurge" in Gnosticism, and that aligned pretty nearly with my experience.

2. Nearing ego-death and in my head having the phrase "I am Who I am" repeating endlessly. It had several meanings. "I am", "I am who?" "Who am I?" "I am who I am." At some point I woke up and was speaking some very foreign sounding language that I couldn't stop and I had never heard in my life. I want to write it off as gibberish but the way the sentences flowed grammatically and my voice inflection was not something I could off-my-head improvise in a made up language and sound that natural.

Later found out that phrase has some religious meaning.

Alright, there's most of the batshit crazy stuff you won't believe haha.

One problem is that the further out the experiences get, the less easy they are to put into words (or even into memories). The other problem is that this can sound like bragging or attention-seeking. Nonetheless, as another commenter pointed out, it might be healthy to normalize some of these experiences (insofar as such a thing is possible). In each case, I'm not the only one who has had the experience.

On DMT, I've had the experience of retracting all of reality into a singularity, where I remained for eternity in infinite bliss, until I ("I") was ready to Big Bang the whole thing out again, which I of course dutifully did. As you can imagine, this is a very condensed version of the story.

I've had experiences of discovering how reality is "actually" a dream, and becoming privy to all of the precise, minute details of how everything is projected from the psyche of the Godhead that we all ultimately are.

I've had the experience of living countless lives, from the perspectives of both victims and their perpetrators, until I've seen very precisely why unerring compassion is the only sensible response to anything, ever, period. Why all evil is illusion, and can only be driven out by light (the primordial love that manifests as all of reality). Why humanity suffers so much: because we project the darkness within us outside of ourselves, so that we can avoid taking responsibility. How we wear these projections as a badge of honor: look, we are the good guys, fighting the bad guys!

I have also had more "conventionally strange" trips (if that makes sense) in which physical laws are broken in arbitrarily strange ways. Think of the old Tibetan Buddhist story of a master who was able to fit a large animal (a yak maybe?) into his shoe, without the Yak getting smaller or his shoe getting bigger. Some of these experiences offered me the chance to use all of my normal tools to confirm them as thoroughly as I would be able in sober reality, until I was thoroughly satisfied that no combination of neurotransmitters or standard physics could suffice as an explanation. I would love to share more details, but I'm not sure I can.

I would not blame someone reading this and concluding that I'm batshit crazy. From my perspective, the crazy part is us being so certain we've got reality figured out in the slightest bit. This belief in a fundamentally lifeless reality is the root of so much suffering (for example, the whole climate crisis), and yet we're doubling down on it. It breaks my heart.

My rational mind has even constructed radically skeptical arguments demonstrating why we should not (see my profile, e.g.). Your mileage may vary, of course.

Edit: wow, a lot in common with gavinray's response.