These feelings are from a different part of yourself- in schema therapy (which is what PreacherHeckler posted about), this is the voice of the punitive parent mode attacking and judging the vulnerable child. To do the imagery, you would need to be in vulnerable child mode, which means that together you and T would first need to move the punitive parent out of the way (by challenging her or sending her away) so that the vulnerable child could be present. Once you had done that, perhaps the idea of the imagery would feel a bit different?

Gosh, this all sounds really new agey (to me) and I feel quite self-conscious writing it, because I'm aware that it's the kind of stuff that would have had me cringeing even a year ago! But... it's the best way I have come across to understand what goes on, and it seems to work.