Liver, Heart and Prostate Problem. YOUR ANSWER WOULD BE A GREAT HELP FOR MY FATHER'S LIFE.?

Hello everyone :) I am a 16 year old daughter whose experiencing a family problem. My father is a policeman and had to stay in his office even though he's health is really poor. And I know he's doing it to fulfill his duty as well as to support our family. His relationship with my mother is somehow unexplainable that's why I am the one who stay in his office and take care of him. But I ram really having problems to cope with that. Of course, I want to be always in his side and do everything I can. But sometimes I tend to be really weak. My father's liver is not functioning well. Some kind of liver cirrhosis early stage, He has a cardiovascular problem and now prostate problem too. That's why his circulation of urine is very slow. But he needs to secrete some fluids though his liver can't filter it well. He take many medications and been hospitalized twice. But he wants to stay in his office. I know that he's trying hard to fight for his diseases..That's why I'm asking for your help. I don't know how to take care of him. I don't know the right food to give , treatment and therapies.. Because i know for the fact that the connection of his liver, heart & prostate problem is very delicate and If I give something against in his body.. I think it may be worsen. Guys, your concern and answers would be a great help to save my father's life. I am also stressed out regarding on how I can handle this very important trial in my life. Thank you and God Bless :D