If you experience symptoms that you think could be from carbon monoxide (CO) poisoning:
Do get fresh air immediately. Open doors and windows, turn off combustion appliances and leave the house. Call 911 from outside your home.
Do go to an emergency room and tell the physician you suspect CO poisoning. If CO poisoning has occurred, it can often be diagnosed by a blood test done soon after exposure.
Do be prepared to answer the following questions for the doctor:
Do your symptoms occur only in the house? Do they disappear or decrease when you leave home and reappear when you return?
Is anyone else in your household complaining of similar symptoms? Did everyone's symptoms appear about the same time?
Are you using any fuel-burning appliances in the home?
Has anyone inspected your appliances lately? Are you certain they are working properly?