question: my husband was just prescribed Prednisone, 60mg, once daily for 3 days to help fight the fatigue he is experiencing.  He is a 3 year Stage IV Lung Cancer survivor, and we are not sure if the fatigue is from the cancer, the Xalkori, the recent whole brain radiation, or just because he hasnt been active in a few months.  How will the prednisone help the fatigue?