It must suck, but Steve Jobs, Stephen Hawking and Ruth Bader Ginsburg all survived for years (well, decades in Hawking's case) with illnesses that surely fell under the category of terminal.
Well Steve Jobs would still be alive today if he'd listened to his doctors instead of going on some weird fruit diet. There's always the story of the guy who was given 6 months to live and then ended up outliving the doctor that gave him that diagnosis but lung cancer is usually a different story. We'll see what happens.