Yes, I've been living in the same flat for almost all my life and many years ago there was some fungus/ mould on the wall of the bedroom. I assume that it's still there even though it's not visible.
But I also lived for a year in a different place and it didn't change this discharge in my throat, maybe it was not long enough?
I also took medicine for allergy and it didn't help, so can I still be allergic to something?