I went to the doc today about the coughing spasms and tight-chestedness I had on Tuesday night. He listened to my lungs and assured my I am getting a good volume of air into the lungs. Nor is the problem related to the lung metastases. He said I have picked up an upper respiratory lung infection and should just lie low until it gets better. He said I need to be careful exposing myself to the cool night air.
I came away quite relieved.