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
Persistent throbbing headaches
Tightness across the forehead
Nausea and or vomiting
Confusion, disorientation, loss of muscle control
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.