Skeezix - I've been racing in this sport for 13 years.
I have lots of races that don't go as planned, where I'm disappointed in my results, maybe I flat, my stomach goes south, I get the living daylights beat out of me on the swim.... but you have to go out and do the next one. You're going to have bad days. But you'll have good days too and it's all worth it for the good days. Don't bail on your race this weekend. Try to relax and have fun. Try to remember why it is you do this in the first place and embrace that. If you have another bad day.... chalk it up to a learning experience. It will all come together eventually.
BTW - I get very down after big races. Even if I do well. It's the knowing that what you've been working towards for months, maybe years is over and you have to let it go. It's the post Christmas thing. Then there's the period of confusion until you find another way to refocus your intention or energy. DH says it's like clockwork. He always knows I'm going to be down after a race and the bigger the race, the bigger the downturn and the longer it lasts.
(((((Hugs)))))))
Living life like there's no tomorrow.
http://gorgebikefitter.com/
2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS