@grandmar, so good to hear from you again. Lung cancer! My goodness. Good for you for advocating to get the PET scan and to get treatment. It sounds like you may have caught the cancer at a relatively early stage. Do you know what type of lung cancer you have/had and what stage? Maybe this will all be revealed at your upcoming appointment.
I agree with @merpreb. You will likely need more time before the pain on the left side subsides. Who is at home assisting your with recovery?