Hi everyone, I am 51 year old female who quit smoking at 39. I thought I would feel better after quitting but did not. I started having breathing issues then and have had them since. Doctors think I have some type of restrictive airways disease and small airways disease. I was told then it might be COPD but super early. I was recently told, almost 10 years later, it might actually be Asthma COPD Overlap Syndrome. My biggest complaint is SOB, most of the time, but a lot worse hours after exercise. Just did a PFT to figure out if there was something else with my lungs during exercise and found out it is NOT my heart, and that I have enough oxygen in my system through an arterial blood gas test. They did find that my lacate levels after exercise are super high, at 10, and I am still dealing with SOB after exercise that nobody knows what it is. Thoughts?