Often the sufferer remembers oppurtunities they let pass in the year, things they put off and friends they lost in the year.
This gloom is contagious so if you think you know someone who has End-Of-Yearitis don't get to close or they will remind you of what went wrong for you in the year.
If your not sure if someone is suffering from End-Of-Yearitis this may help
Symptoms of this include:
-Black Marks under eyes from lack of sleep
-General Zombie-like state*
-Lack of New Year cheer
-Reluctance to give gifts (though they could just be being an asshole)
*Like wandering aimlessly around their place of residence, staring into space and being scary lookin'
Time (about 2 months) is only known cure for this disturbing affliction. Though ice cream and sugar in general is known to help sufferer get through it.
This illness can very easily be confused with Suddenly-Dumped-On-Assitis as the symptoms are very similar.