One bad outing ain't nuthin but 1 bad outing. Whup-de-do square yourself up and get back out there and kick butt.
It could be as simple as a bad mound or timing, was it all of your pitches? if so timing is likely the issue, or aiming instead of letting your body flow to the target...heck man it could be many very fixable things...I always suggest just backing up a little and going through some fundementals and relaxing. If you put those negative thoughts in your mind you may start to succumb to them, I say banish them, get a little swagger back in your step and forget about it.
And don't come on here with that baloney anymore...the sissies only site is three doors down and full of wimps who bed wet themselves