I have had swollen lymph nodes on my neck and parotiditis, now they found a mass in my lung and half is not working?

Maybe sarcoidosis?: ..Usually a benign condition, but can cause lung or other organ scarring in a small % of patients. It also sounds like you have a doctor, and for the complex situation you describe, you are better off asking questions of docs who know your history, than trying to figure it out online. I tell my patients, use information from the internet to get the questions to ask your doc, not the answers.