What Causes Pain While Breathing In And Breathlessness?

Question : Hi my husband went to hospital last year with pain when breathing in and shortness of breath. At first he was diagnosed with LRTI and given oral antibiotics, he was then taken of them and sent home as another doctor said it was musculoskeletal pain. He was readmitted with the development of severe chest pain on breathing and over the next 24 hours declined rapidly and ended up in intensive care. He was put into a coma and on a ventilator and they said he had severe pneumonia, they drained 900ml of fluid from a pleural effusion and he slowly recovered but it took 3 months for the pain to reside. He has now been told he has a raised right hemi-diagphram and suffers from shortness of breath and has trouble clearing mucus. Is this due to the pneumonia? He had no problems up to this point.

From what I have read there must be a cause for a raised hemidiaphragm either within the diaphragm, below or above. He had a CT to check for below and nothing untoward was found but all they have said is that the diaphragm is moving 2-3 intercostal spaces on deep inspiration/expiration, but they have given no cause for why it is raised,on discharge from hospital over a period of six weeks his breathing did get deeper but then stayed the same. he did have pleural fluid left in his lung after the chest drain as it was taken out because it became blocked with a gungy substance, his right lung was a complete white out and he had a medistinal shift. He did not have any breathing difficulties prior to this and his breathing has never returned to normal since.