Yes I have smelled the poop smell
in the past as well, in fact that seems to be first with
the gas fume smell
following it's heals. The latter makes me nauseous, I have always hated deisel fume smell even before this started.
The one symptom I haven't seen above that I also have especially during one of these "episodes" is severe dry heaving. For me this all started again 4 days ago while cleaning my Mom's house out, ALOT of dust, the heaves came on so bad it was embarrassing.