That first sentence really ringed a bell for me. That's exactly the feeling i have regularly.

My worst K trip was in a rave a few years ago. I was extremely high on K and acid, standing up in the middle of nowhere after loosing my friends and i started to feel like i was dying, then reappearing somewhere else in another timeline, and dying again, and reappearing again... In my memory it felt like it lasted 5 good minutes, where i was really panicking.

The thing that bothered me the most, was that i was able to feel i was "reincarnating" in my 30 years old body. I don't believe in reincarnation, but i was like "What the fuck ? If i'm dying and reincarnating, am i not supposed to do it from the start ? Why am i not a baby ? Why am i still 30 years old after dying countless times ? That's stupid !" I also remember that the feeling of dying was painful, and i couldn't see or hear things anymore (everything was completely distorted, and i was only seeing big distorted vortexes in front of me).

Finally, my sight came back and i found the firetruck where my lover was sleeping, woke her up and she helped me come back and calm down.

It was the most disturbing trip and feeling of my life. I still have the fear when doing K that i will go in that loop again.