I remember when I first began therapy and healing seemed a light at the end of the tunnel. Surprisingly, my symptoms got ever so worse, the tapes in my head played louder and louder even with my face over the throne, heaving. My anxiety about doubled, and I was almost nonfunctional. My wise therapist made a comment that changed my whole perspective: She said the demons (yes, she used that word) get scared when their usual tactics don't work. She said they must be desperate when so many of them and so loudly had to attack me through my most vulnerable places.
That's what I think about your demon brother. His first few attempts have not yielded the results he wants, he's getting scared, so he's enlisted more demons to attack you through your most precious areas - your D. Maybe thoughts of his desperation can help you see you are actually winning.