Symptoms of Carbon Monoxide Poisoning: 
From the National Fire Safety Council, Inc.    
   
Symptoms can mimic a common cold, a hangover, food poisoning, depression, sea sickness, intoxication or the flu (without body ache or fever).  Look for patterns.  Symptoms may disappears when away from the house (or vehicle)and reappear when you return.  See if others, including pets, suffer the same symptoms at the same time. 

Seek medical attention if you suffer from any of the following:    

• Dizziness, ringing in the ears
• Blurred vision, burning eyes
• Intoxicated appearance
• Persistent throbbing headaches
• Tightness across the forehead
• Pale skin
• Nausea and or vomiting
• Confusion, disorientation, loss of muscle control
• Fainting, unconsciousness
• Fatigue, never feeling rested, sleepiness
• Shortness of breath
• Chest pain (angina) when exercising
• Rapid heartbeat/pulse, fluttering or throbbing heart, tightening of the chest

CO poisoning is especially toxic to infants and children; a pregnant woman and her child; the elderly; smokers; people with anemia, coronary or respiratory problems; and people with immune system disease.