My husband has been diagnosed with Alzheimer's with vascular dementia he was always a hypochondriac and is fixated on illness. Help.

He has always had a fixation with illnesses, death medicine etc. It takes us a few hours to take his meds although I have them listed in the whiteboard and he checks them off. He has to read the bottle know what the pill is for..i tell him repeatedly. I can't hide in food..because he frequently will not eat. He has a desire to see doctors daily. He had a medical issue. But after surgery and monitoring..that problem is solved. So now he imagines illnesses and makes appointments on his own. He no longer drives so I usually take him. He has called a sister to take him to his bogus appointments. He gets there doesn't know why he went. He has access to his appointment book and phone. And makes appointments. It is futile for him to go alone because he does not
Recall why he went or what was said. He is a Phd. Cunning and manipulative. Will cry and rant and rave. When denied. Absolutely no reasoning skills....but has seemingly rational conversations with visitors and family...so they think I'm off. Help