Delusions with dementia

I am writing to vent my concern about my father, who has Lewy Body dementia and has one central delusion (false belief) that suddenly exploded today.  The woman who used to own his house is till friends with the neighbors and visits them periodically.  She has a mental illness which involves paranoia.  My father believes every story about the listening devices in her walls, and the people piping carbon monoxide into her home, and the staged car accidents and how the police laugh at her.  She reported more incidents over the weekend that he heard about from the neighbor, and he got all riled up about what a horrible community this is and wants to deliver the "evidence" to all the locally important people to get them to take action and threaten to tell the newspapers about it.  He barely slept last night because of this, and was so riled up he fired one of his home care aides because she didn't believe the whole story.  I handled this by listening to him for an hour on the phone detail the entire conspiracy and his plans trying not to contradict him but distract him a little, explained the situation to the caregiving agency, delicately asked the neighbors to reduce his exposure to this topic (delicately because apparently they believe it too), etc..  Now I have to talk to the doctor who just switched him from Aricept to Excelon to see if it could be causing a worsening of symptoms or if we need to start an anti-psychotic.  I think the hardest thing of all is feeling like I am the only one here who understands the whole picture and can handle it effectively and part of me doesn't want to!  So, I am looking for sympathy if anyone has any to offer...