Common symptoms are:
Appreciation that the ringing in your ears was worth it
Unable to take off the festival band for at least a few days
Listening to the music of bands you saw on your ipod
Youtubing videos of the festival
Stuffing yourself with food
Some more dangerous symptoms are:
Making your toilet filthy so as to reenact the festival toilets
Camping out your backgarden
Not feeding the cat
Continuing to dress zany despite being home
Guy2: he's suffering from Post festival depression, Like he started singing at the top of his lungs on the phone ''I WANNA KNOW WHAT LOVE IS'' before hanging up crying
Similar to post concert depression, but far more extreme considering the length of time spent in your Nirvana.
Oh just Post Festival Depression, this weekend was amazing I actually can't believe I have to wait another year to be there again.