"I just don't know what to do to help him." Aah, but you are already doing the very best things possible - you are THERE for him and concerned about his well-being. You have reached out for support so that you will be prepared and have others in the same situation to turn to with your questions.

Please, when you have the time and energy, take a look at these other groups on Connect, https://connect.mayoclinic.org/group/lung-cancer and https://connect.mayoclinic.org/group/lung-conditions where you will find others sharing those journeys.

And above all, please take care of yourself. This is a strenuous journey, and you need to stay as healthy as you can.
Sue