Sorry to hear about your difficulties ! It does seem as if your husband is suffering with some kind of paranoia which could respond to treatment ....if only he would seek it ! Like another post on here, my husband was diagnosed with front temporal lobe vascular dementia (mild) with narcissistic personality disorder, following his second mini stroke However, my problem is directly the opposite ! He is always right ...never listens to anyone, to the point of rudeness. We no longer have any friends, as he has told them all to go away ....In the beginning I would go and apologise to people for his behaviour...now I have no one left to apologise to ! He is slowly getting much worse ...now he does not understand what people are saying to him ...of course it is not his fault, but every one else's ! It comes to the point where I simply cannot take any more but what can I do > He was the life and soul of every party when I first met him when he was 68 and since then has renovated two houses driven hundreds of miles between Spain, the UK and all over France...I try to say to myself he must be very frustrated now by his inability (on medical grounds) at 84 to stop driving ,,he doesn't speak the language or understand anything, so all the dealings with authorities, medics. etc are down to me. Luckily I lived on my own bringing up my daughter so am used to dealing with everything ,,,but lack of friends or even family that bothers to contact him, is driving me insane !
Is there anyone who knows him well enough to treat what he says about them as a humerous thing ? Have you asked the people he says are saying nasty things about him what they actually said to him and what was his reaction ?
I am not an advocate of Dr Google, but sometimes you can find support from a group for people with your problems/his problems and a problem shared is a problem halved ......the mental health organisation MIND (not sure what it is called now) might be able to help .....or the Alzheimer society (they do not only deal with diagnosed Alzheimer disease) There are many types of paranoia and it does definitely seem that he has even maybe, a mild type perhaps
Good luck ...very hard for you and the family ! 