Well he might feel angry because he is going through a hard time. He might be angry at God because he is in the hospital and when the pastor comes to pray with him he might be like you’ve got to be kidding me. A lot of people experience this. They get angry at God when trouble comes but you should never do that. God doesn’t allow hard things to happen to you so that he can see you suffer. No! God loves you and he hates when his children have to suffer. But God allows hard things to happen to you so that you can turn to him and trust that he will help you. Hope this helps!! God bless! :D