Interesting. We have similar complications. I too only have one lung with fluid, the right one where the wedge resection was done. And it is my right lung that hurts when I take a deep breath. This was my first surgery, and I am ten months out now. I too was not getting the exercise I needed because of the winter months and was nervous about going indoors. It led to deconditioning. Cardio rehab after April Stent really helped me get going again. Everyone wore masks and they clean the machines after every use. Walking helps! However, my shortness of breath has increased lately with the lung pain. I am awaiting the conclusion of my blood work from Rheumatologist to confirm or eliminate an autoimmune issue. Then they can decide next step - thoracentesis and maybe I have something unusual going on
I envy you your oxygen levels. Mine were 88-89 with light exercise in cardio rehab. I have 4 other lung nodules (ground glass to semi solid) being watched. With everything going on in my lungs I just don't know how much it all is compromising my abilities. I will have to ask. I have been reading about long Covid, I don't need that.