Charlotte Perkin's "The Yellow Wallpaper"

I have actually never read this short story before, although the name sounded familiar.  I think the story starts out somewhat slow, but then picks up in the middle, and especially during the end.  The paragraph was definetly the climax of the story in my point of view.  However, the climax and the events leading up to it were very confusing.  It confused me how Jennie left the narrator in the room, and then the next thing I know she was in the wall paper herself, and became a "creeper" among the other women "creepers" from the wallpaper.  It also confused me how John fainted and is now under her and in the way of her path, so she has to "creep" over him now?  I will most likely need an explanation to this story being that I have read it twice now already today.  Overall, the story was good, and I think the narrator becomes more ill and sick throughout the story mentally.