Hi and welcome to TP. I would absolutely agree that it would not be a good idea to discuss this sort of thing in front of your husband. I've recently replied on another thread that what I used to do was to produce a statement "To Whom It May Concern", which I regularly updated. I'd then ensure this was presented, in advance of our appointment, to any professional we saw.
John would frequently complain that he couldn't sleep because "all the other men are making a noise in my room". In his mind, there were other people present in his bedroom, and I learnt it was futile to argue, because he could see them. So instead, I would march into his bedroom (he'd be cowering behind me) and shout, into the empty room, "Right! You can all clear out now! This is John's room, and you have to leave!". Then I would open the front door saying "Go on! Off you go!", and then turn to John and say "they've all gone now darling", and he would be so pleased.
It took a long while to learn the various tactics that worked, and after a while, you realise that what you can see, and what they can see, are both very real to each person. And you learn to go with the flow. Hope that helps. xxx