How To Treat Loss Of Appetite And Headache In Patient With Alzheimer S Disease?

My father has Alzheimer s. He fell a few weeks ago. Since then he sleeps most of the time,eats and drinks very little,has had only 1bowell movement,but also grabs his leg/side on which he broke his hip last year/.l know it really hurts by his actions.he also grabs his head as it hurts also. What can you tell me