I would say:
you not trust your trading or your judegment. the market is full of shit. always there is people try to pick bottom. I was fooled by it many times. I did the same thing as you did today. I shorted the morning jump of YM ( already see dow will be 5000 very near, what the fucking of me got out at 6850! still there is 1500points gain ahead), bought FAZ in the morning dip, I tried very hard to hold them, but very funny, when i saw those little up/downs, I got out with minor profits (half the big movement), not too bad, but still bad, that means I bought the market in the trending down!
you are not alone. that is why this game is hard! since we are deal with uncertainity.