@hishamhussain, I had been having a post nasal drip. So I think it came from my nose. But doctors are not for sure what was going on. X-ray, stress test with imaging, pulmonary function tests ruled out lung or heart conditions. We are treating it as being related to seasonal allergies which were really awful in my area this year. My only experience with any kind of a breathing/lung issue is very recent.
Has a doctor given you any information regarding your x-ray and your swab results?

I am going to ask @hironopiro and @katemn to look at this question for you. They might have some useful suggestions for you.
Sending you strength and hope, Rosemary