How To Diagnose The Presence Of Formaldehyde Poisoning?

I think I may have Formeldahyde poisening because I live in a1969 double wide mobile home and I have come down with Interstital Lung Disease but they can t figure out what is causing it. I have been tested for everything and had 2 biopsies, one through my side. They said it wasn t Cancers, Emphazema, Asthma, Lupis, or any of the other big diseases. I have all the symptoms of the Formeldahyde Can you please help me??