Greg,
I will continue to pray for you and your family. My wife lost her mom to lung cancer, so I can empathize with you. Fortunately for her, there was little pain, and in the end she died at home with my wife at her side and all the family there in the house. I couldn't have chosen a better way for my wife to be able to say good-bye.
I pray that when the end finally comes, God allows you the same opportunity.