My grandad has recently been diagnosed with Alzheimers. He fell off a ladder 12 weeks ago. He was fit and healthy n since then he has rapidly gone down hill. I have been researching capgras syndrome n this describes him exactly. He thinks he has an identical house and wife somewhere else. He is always looking for it and is a changed man personality wise. My lovely gentle grandad is now an agitated unsettled man. We are concerned at how fast he is going down hill. Every week he seems so much worse. Its just happened so sudden. The doc has ruled out delerium. Today I have been to visit him. He seemed OK...fidigity and constantly looking out window. He also said there was a man digging in the garden but nobody there. When I was about to leave he said who is taking me home? We gently told him he was at home and not to worry and he slammed his coat to the floor and was so angry! After leaving, my mum has had to go back to him as my Nan said he was banging on the window, shouting at the doorstep and just completely lost the plot. I am so worried... Surely this doesn't progress this fast....he has been prescribed diazipam to calm him but this hasn't made a difference tonight. Don't know what to do...