Saw this article from the New York Times on A Cup of Jo and thought it had some excellent points on what to say and what not to say to a sick person.
Highlight: "I SHOULD BE GOING NOW. You’ll never go wrong by uttering these five words while visiting someone who’s sick. As Ms. Pogrebin observes of such visits, don’t overstay your welcome. She recommends 20 minutes, even less if the patient is tired or in pain. And while you’re there, wash a few dishes or tidy up the room. And take out the trash when you leave."
My personal favorite thing to say in an awkward/sick/death situation is acted out in this scene from Steel Magnolias via youtube.com. Geepers I love this movie and all of the crazy southern characters! Seriously, if you have not seen this movie, you need to borrow my copy.