Google Dr. Matthew Kaufman he can repair the Phrenic Nerve I'm scheduled for the surgery in a few months I have the same issue has you, but I have no idea what caused mine I was told by doctors not to worry about it for 10 years I should have gotten more information. You want to get it fixed sooner then later because when it first happened to me was 10 years ago I didn't notice a problem as time passes the diaphragm muscle weakens, thin's and stretches into the lung cavity reducing the capacity. Also as you gain weight like I have from my late 30's to my late 40's the extra fat grows into the space below the paralyzed diaphragm making it worse. The best thing you can do is stay as thin as you can that helps a lot but at some point have to do something the diaphragm can split herniate they told me if that happens your lung could collapse. Now I have many symptoms such as shortness of breath, chest colds that take me 2-3 months to clear the lung, Sleep apnea. Even today if you talk to a Pulmonary doctor they will tell you it's not possible to fix the phrenic nerve they will direct you to plication which is a major surgery compared to what Dr Kaufman is doing. Dr Kaufman said he has done over 400 of these operations in the last 10 years and most recover 80% of the usage of the diaphragm. The plication surgery you only recover 26-28% of your lung capacity. If you read others who have had Dr Kaufman repair the nerve Lung doctors still don't believe it until they see the results of a sniff test shows the diaphragm moving again. I was surprised that they didn't even want to look into what Dr Kaufman was doing.
Who does this kind of surgery. I talked to him on phone he said I have to wait 8 months and I have been on oxygen since June when this happened