Note that the diagnostic criteria for DD specifically states:
"Olfactory or tactile hallucinations may be prominent, but only if they are related to the content of the delusion. "
My husband had tactile hallucinations specifically related to his jealousy sub-type DD (that my vagina was stretched out by my gigantically endowed lovers - a specific hallucination others on this forum have also heard from their DD spouses). That these hallucinations are nearly identical from person to person really makes me think this disease is organic, not related to childhood traumas, and is not something that can be effectively treated by talk therapy, just like you can't talk your way out of cancer. But even the drugs available today only dull the symptoms, they don't eliminate them, or give the person any understanding that they are sick.
After reading all these posts, I am coming to believe that the jealousy sub-type isn't the worst one - that all my husband's delusions centered on me being the bad person, allows him to be quite happy as long as I am not in his life. And after all of this, I still want him to be happy.