Hello,
I recently was also subjected to a barrage of scans and tests to check for malignancy as well, all clear barring scarred lungs and an airway obstructed by mucus plugging. If they find cancer there's a lot more they can do for it these days and if it is that there's nothing you can do about it now, if they find it, you can start treatment and you'll be in a position to reassess with the full facts at your disposal not just fears. I am still waiting to hear back from a specialist about the lung scarring and obstructed airway, so I get how nervewracking it is waiting for a potentially terminal diagnosis. Here if you need anything.