I can help you, and understand PFT very well
You could be having small airways obstruction, which is now increasing .Please share details of your problem- since when do you have breathlessness, is it increasing progressively, do you feel tired soon ?
Share your results of complete blood picture, X ray chest, C.T. scan of chest if done, P.F.T.
Next Steps
After knowing above details, I can guide you. you can connect with me .