I developed epilepsy a few years ago and each of the two times I had a waking tonic clonic aka “Grand Mal” it felt like they describe the brain when it’s dying.
It’s the closest thing I’ve heard people describe as dying so it can be profound.
Incidentally my neurologist said that she had patients that don’t stop their seizures because they feel like they areare mystical or part of their mental work. That’s a wild thought to me given the risks, but I can understand it, given how you feel on the other side.