HELP! carbon monoxide poisoning?

is there a way to check w/o a detector? i am very dizzy, nauseated, very irritable, and my throught is closing up slightly but that may be my asthma. before i got any of these symptoms i was considering going for a walk because the poor ventilation is making me irritated. BUT PLEASE DONT ANSWER UNLESS you know what you're talking about, CO is a huge deal and it may just be hungry/asthma.