What you are describing is a similar circumstances stance I had when I had a fungal infection. I was working in a hospital lab and started to cough and felt lightheaded all the time and my blood pressure was a erratic.

To make a long story short after seeing several doctors and having several test done, I took it upon myself to put a mold testing dish in the vent in my lab. Sure enough there was all kinds of mold growth. So a doctor I work with gave me a prescription for an anti-fungal medication. Such as Diflucan. When you have a fungal infection taking antibiotics makes it worse and makes it spread.

I would suggest you talk to your doctor, even if they argue with you, insist you want to be tested with an antifungal medication. There have been instances where people have had lung issues and other issues thinking it was some kind of cancer, and it really was fungus growing.