Alzheimer's

How does one describe what it is like taking care of someone with Alzheimer's?   Today is my day to take care of my father in law.  I never know what to expect but one thing I know is that if I shower him with love, smile, gently hold his hand, and rub his back we get along fine.  But if you try to force him to do anything get ready for a fight.  So I don't argue, or force I just go with whatever he says even though nothing makes sense.  

Today he is being a bit ornery since he has decided not to eat.  I fixed his lunch up when he gave me the littlest hint that he might eat, but after two bites he got up and has been wondering around the kitchen ever since....sigh....