How can you tell if someone has swine flu, and how often is it fatal?

Hi, I think that my dad might have swine flu, by reading the symptoms. He is 45 years old; he has a terrible cough, hes very achey and he seems to be dead tired all the time. I'm really worried about him , so if you could please let me know everything that you know that may help, i was also wondering, how often this disease is fatal, and if you have it , how can you reduce your chances of dying, and lowering the symptoms. please post answer quickly im very worried ! :(