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If you are experiencing symptoms of the flu, you might want to make sure that it is not something else. Justin Foss with Alliant Energy says that the flu symptoms can be similar with those of carbon monoxide poisoning. Some early symptoms for carbon monoxide poisoning are headache, nausea or vomiting, dizziness or disorientation, fatigue, muscle weakness and difficulty waking. The best way to avoid carbon monoxide poisoning is to purchase a carbon monoxide detector.