Apparently, there's a name for this. It's called PEWS, short for Post-Election-Withdrawl-Syndrome.
According to Urban Dictionary
The feeling of general depletion and emptiness in the few days after a presidential election. Caused by the sudden withdrawal of any campaign coverage, sound bites, or pictures of babies being kissed. May be accompanied by aimless clicking on news websites looking for something to read.
*NOTE: This condition has been observed in people whether their chosen candidate won or not.
Wife, to her Doctor: "I'm worried about my husband. Ever since the 4th, he's just been sitting at home wandering the New York Times and CNN for hours on end."
Doctor: "I wouldn't worry about it. He probably just has an acute case of PEWS. He should be back on his feet by the end of the week."