T - I stress about it all. Especially if the night before I know that something is not right, like your bike. Worse tho is the way I analyze every little part of my race and compare it to those around me. I really stress about that. And what I hate is that I spend a ton of time on my bike and that is still my weakest event relative to the crowd.
So yeah, we all have our stressors. But you'll get through tomorrow and it'll be great, what ever happens.
Good luck!!
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