I am at IU Medical Hospital in Indy. My doctors are trying to determine the cause of my chronic cough, fatigue, clear sputum, weight loss, loss of appetite. I have 18 nodules in my lungs. They have been biopsied but are not cancerous. They have done over 30 blood tests, CT scan of my lungs, PET scan, lung function tests. Everything is normal except for the cough and other symptoms listed before. No one knows what is the cause. What would be next steps to diagnose?