Awestruck grief

Words cannot describe the grief that I am going through now... with the knowledge of the possibility that my father's days may be numbered very soon. Further tests need to be done for confirmation, but my mind is full of anguish and sadness, as I do not know what I should be doing now. I feel so helpless. I do not want to eat, I do not want to do anything, I just do not know what I am supposed to do. I want him to know God, so maybe I should dispel all my energies onto that course, instead of worrying about what would happen in the future.