Hello,
It is very possible that you have mono due to your symptoms of fatigue, swollen lymph nodes and sore thorat. Some people have a normal appetite when they are ill, so that really isn't all that significant.
Here is some info, please let me know if you have questions.
http://www.mayoclinic.com/health/mononucleosis/DS00352
http://www.mayoclinic.com/health/mononucleosis/AN00661
http://www.mayoclinic.com/health/sore-throat/DS00526
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