In my lectures, I point out the eliminatory processes of the body which may answer your concerns or atleast give you some direction.
In the digestive system, there's always involved the bowel elimination which is dictated by the liver's production of bile (the body's own laxative and cleanser of the bowels). So, if the bowels aren't being cleansed normally due to a sluggish liver (undetectable by modern medical testing) then waste will begin to build up into the other eliminatory organs such as the lungs. So, in order to have a thorough healing, you need to address the digestive issues as well as the lung issues.
I know this isn't very specific, but I thought it was an important thing to share.