What are symptoms of Phrenic nerve damage?

I'm interested in knowing if it did correct itself. I had the same in 2017 and it has never recovered despite all heart drs saying it always does and they have never known one not to recover. i'm still breathless and very debilitated. Six years later!

I have phrenic nerve issues, and have SOB, A doctor can order a sniff test and a visit to a resp therapist and stick you in a chamber and measure your inhalation and exhalation rate. I have moderate but not severe impairment, I had a simple xray and saw one side was not like the other and had zero injury and zero trauma and zero surgery, I used to run everywhere (military) and WHAM just like that I have SOB I still work out and train and can do alright, but sudden exertion or core exercises kill me I am so angry