Well Fanime is four days but I'm still post-con depressed regardless...
I'm keeping myself busy by looking for my pictures and looking at others' pictures. I'm also currently writing my blog entry on the Gurren Lagann panel (world exclusive at Fanime woot!) along with my overall con report.
write down everything you did, and saw. with pictures, when possible.
If you're feeling a post-con depression, then you haven't written enough. You should've brought a recorder with you into panels; or a camcorder for video, or a smartphone for live twittering. If your lack now makes you feel bad, then you should feel bad. You've failed us.
If you can't enjoy it by itself, on its own merits, and walk away sated;
then you need to blog the hell out of it. Before, during, after, long after, and anticipatory and preparitory to next year.
...and alcohol is really good, too. Though I tend to use that to self-medicate to alleviate demophobia during the con, and afterwards it's more a part of the general-background-drunk, as opposed to a directed cure toward any particular post-con-funk.
I hate coming back from con cause I realize how boring my life is. I always call Con Heaven and my hometown Hell. Being at con I feel so at home and with my own kind. At home I feel out of place and surrounded by people who stare at me weird.
Both Botcon 2010 and Star Wars Celebration '10 were in Orlando this (or I should start saying last) year so I had a blast at both, guess living in theme park central helps but what helps even more is the booze. LOL... I'm a very sad man...