anxiety
"Retired friend had tumor behind ear and severe pain problems for several years.  One medicine he was taking was alprazolam.  20 months ago he started imagining things (people digging up yard, etc.).  Doctors said he had Alzheimer's and put him in nursing home.  He did not know me.  Acted similar to my mother who has Alzheimer's.  I couldn't understand how it came on so fast.  About 3 months ago they took him off alprazolam and his memory immediately started coming back.  Last week he went home.  I visited with him yesterday and his memory was very good.  Even told his wife where they had stored something several years ago.  Doctors have no answers.  First Alzheimer's person to be "cured".  Still has pain pump for his pain."