As I drove home one afternoon recently I experienced a sudden, out of the blue "pang of sorrow" (is the only way I can describe it) enter my heart chakra. Yet I had been fine a moment before.

Thinking about it (while I used techniques to rid myself of it) I am sure it was brought on by stress. Either one weakens & becomes vulnerable to attachment, or else one manifests something of the kind so as to distract oneself from the source of the stress (work plus insane director in my case)

Anyway, it was a very physical feeling of something foreign entering right into my body, & spreading 'tentacles". It's gone now, & I was able to observe the whole process rather dispassionately, so think mentioning it may be of some help to others who experience this as sort of "attack"?
(edited for typos, think I am becoming dyslexic!)