Could Collapse Of Lung Be The Cause For Hyperinflation And Shortness Of Breath?

Good Day My son has been suffering for almost a year now with hyperinflation, shortness of breath when active and low saturation levels if not permanently on oxygen. He has some form of fibrosis of the lungs from previous infections. He has never had a proper diagnosis of what his condition is but it appears that he has some form of pulmonary dysplasia possibly asthma but he has never been well enough to make a proper diagnosis for asthma. He has very sensitive airways and the right middle lobe of his lung is partially collapsed but we have been told that for the amount of lung that has collapsed, his hyperinflation and shortness of breath seems to be far to much. He is on bronchiole dialators, almost always on antibiotics because he seems to catch any infection very easily and is on permanent oxygen. He will be 3 in March. Is there anything that you can recommend I can do, or something you can suggest that maybe the doctors he has been seeing have maybe overseen, please I am desperate to get my son better. Kind Regards, Steve