I just read you post and had to reply lol
About 15 or 16 years ago my brother was walking home from school (he was about 15 at the time) and he had a similar experience.
An old woman stopped him in the street and gave him 3 stones (they were like marble if I remember correctly, silvery white)
She started rambaling in some language he didnt understand, then spoke in perfect english. She said that there are Gnomes and Faries all around us,
but we cant see them because we drink too much coffee!?! She then proceeded to waddle off down the street.
He came home and was white as a ghost. Back in those days before i was awake to whats going on in the world i made some fun of him, i told him it was
just some crazy woman.
Infact untill this day i thought that, but after your post it got me thinking, it just reminded me of what happend to him.
Ok so probably not the same thing but still thanks for sharing man