That's not true. You sound like you're white as fuck :| you don't think there are things that can influence someone's brain and body? Human, human technology, or a wide variety of non human things?
Should Google (edit: Kagi*) DMT trip reports as one example.
Sorry to hear that, I hope you get through it alright. It's easy to lash out at people when grieving, but it will eventually turn into a disservice to yourself. If you want to somebody to spill your shit too, send me a PM. Sometimes it just takes writing it out