I firmly believe that willpower can be a major contributor to medical recovery. My mom was in the hospital with a very extreme case of blood flow blockage to the intestines. At one point she was extremely critical and two different doctors gave her no more than 24 hours to live. She recovered and lived for 14 months.
It was only after she finally stopped fighting that she failed. She told me she was tired and then passed on within a week.
So, I tell anyone who is in a dire medical condition to fight with all their will and energy.. Don't depend only on the drugs and doctors, but bring your own will to survive to the battle.