Why would benadryl cause a problem? In the UK it's an allergy medication. (I've never taken it, but I'm surprised an over the counter would be dangerous.)

I wonder, from what you've said, if psychotic experiences might not just be people working through "baggage." As you say you had difficulty with your son as a teen, and are now repairing your relationship. I'm similarly repairing my relationship with my Dad... I wonder how common this is? If psychic trauma when you're younger causes a hiccup, and perhaps psychosis, properly managed, can be healing?