In the room 237 scene, Jack relives his own molestation as a child by his mother. Top left and right: Jack's mother initially appeared enticing to him when he was a child, just before she actually started to molest him. Above left: Once Jack's mother started molesting him, he started experiencing her as if she was a rotted old hag, as represented by the old woman in the bathroom that Jack is hugging, being rotted. Above right: The old woman in the tub represents Jack's actual mother, in that she has the same physical appearance as did his mother when she was alive; except that she is here partially rotted. She is rising from the water, with the water symbolizing the prima materia (the starting material that is required for the alchemical process), which is associated with the alchemical nigredo, indicating that this entire scene depicts Jack's nigredo. The green coloring of both of the old women's skins indicates putrefaction, and as observed in part 16 of the analysis, putrefaction itself is associated with the nigredo.
Since Danny is witnessing all of the above 'telepathically', the entire scenario also represents the molestation he himself is suffering from his mom. That he is choking or gagging not only indicates that he feels sickened by these encounters with his mother, but, as we've observed earlier, it is also tied in with death of the Holy Spirit.
The events that take place in room 237 are, in part, a representation of the continuing cycle of sexual abuse by the mothers in Susan Robertson's husband's lineage, down through the generations. This is why Dick Hallorann himself also experiences the vision (in addition to Danny), for recall that Hallorann is the mediator between Susan's unconscious and her conscious mind. The cycle of abuse by the women in Susan's husband's lineage has been made conscious to Susan.
