Amber,
It is possible you are suffereing from depression. It is also possible you are suffering from holiday overload. Real clinical depression is usually something that persists over at least six months.
Here are a couple of links that will help you research
http://my.webmd.com/condition_center...000_1053_00_02
http://depression.about.com/mbody.htm
If you suspect you might be, after reading the information.. please check with your doctor as she/he is the only one who can diagnose you.
Good Luck