My father in law who is aged around 75 is suffering from some mental problems, he can see illusions, he feels scared of those people whom he sees in his imagination, or else he is pretty good with no problems, I reaaly need to find out a reason for this, we did consult a Psychiatrist, but he just gave him some medicines which actually did not work fine, we did visit a neuro surgeon and also got an MRI of his brain ad he told us that he has alzhemier, please suggest, as it is becoming really difficult to live with him.