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It could be possibly a flu virus. Maybe one of you went out caught it from a friend, brought it home and your sister/you caught it. Are you guys having any other symptoms besides a headache? Such as vomitting? Stomach aches? Food poisoning is never JUST a headache.
Once my dad caught the flu from a client that is a doctor, the virus passed onto my brother, then me (and I had it worst). I was out of commission for days!!
As for food poisoning it shouldn't last for more than 24 hours as your body will auto-cleanse getting rid of all the bacteria. If it persists though you might have caught semonilla (spelling? sorry!) or something badass like that and will need a doctors aid.
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 tiptronic: getting cut off by bicycles since 2007
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