I'll keep checking, and keep y'all posted if something comes up.
I think what got me going is that you reported some difficulty with breathing...that sets off my alarms, every time (I'm a nurse). Immediately, I worry. Can't help it, you're a fellow FReeper.
My concern is: suppose you go to bed, still breathing okay, and the air quality gets worse? Will that incapacitate you?
I don't mean to be alarmist. The other thing, of course, is that I'm a grandma. We worry as an absorbing hobby. ;-D