my dad has recently been exhibiting several characteristics that he never has before. after a simple nose bleed, paranoia of dying came about. he no longer trusts his doctor, my mom, myself or any of my sisters. he thinks we want him to die. he has stopped eating the past 3 days, stopped taking his meds, doesnt sleep and is constantly aggitated. he claims we are trying to poison him with food and keep switching his meds. we try to reason with him, and assure him we all want him to get better, but he keeps telling us that he was not a bad father and why are we treating him like this? he has gone to complete strangers telling them that he is sick and we are doing nothing for him. we dont know what to do or even approach this. any advise please?