Hi, I'm a 20 year old female and on Sunday I was in Colorado Springs( which in comparison to Las Vegas is at a very high elevation) I had Chinese food for lunch, and that night got really sick. I figured it was 24 hour food poisoning, but although my nausea and stomach pain has gone away I now have a headache, extreme lack in appetite, fatigue and mild body aches since then. Is it possible it wasn't just food poisoning, but the flu?