Hello - Sorry for the delay - I ran out of battery last night and never saw all the posts.
I don't have any experience with lung cancer, but I have had small nodules, in my case related to a mycobacteria infection. If the amoxycillin doesn't resolve the "ground glass" please ask them to culture your sputum, and see if you have an infection that requires a different antibiotic. People with COPD are susceptible to many different types of lung infection which can be treated.
Do you have a return appointment scheduled?
Sue