Mr heater giving off smell stinging my eyes

I am like an 02 sensor if anyone uses one of these, I get dizzy easy, everyone ells
seems to be fine, but not me, gives me a head splitting head ache the next morning.
I walked in a girl friend house back before I met my wife 35 years ago.
She had Lp vented gas wall heaters and I did not last 30 minutes in her house and had to lay down and get up and go outside, Her parents had the system checked with a
carbondyoxid (how ever you spell it) tester and sure as heck the level was to high.
I guess some folks can handle more of this stuff then some of us.