Seraphim this mechanism is very well understood. There are papers and research on the release of 5HT and cortisol and the effect thereof. It is reprodiycable in a lab!
But to give you credit and assume you did not know that, gaian how are you assigning a soul to someone experiencing odd things following trauma?
Drugs can evoke new experiences, not within the memory banks, again such as 5HT receptors with DMT.
Where on earth does your biblical soul fit in?
You appear to br grasping at straws and putting forward all the things you consider a mystery about the human mind as reasons for a soul. The problem is they are not a mystery for anyone who has pixked up a book on it.
I mean no offence, again, I am just being practical and honest.