Two suggestions: First, go over your games quickly and write down what you were thinking, as best as you can remember it. _Don't_ use this as an opportunity for self-criticism; that comes later. Right now, you just want to write down what you analysed, how you thought the position stood, what moves surprised you.

Second, don't get discouraged. Go play over some games of Nezhmetdinov. Remember why you like chess.

First some questions: What about time management? Did you really use all your time? Did you use your opponent time also? BTW what were the time controls?

Second: Don't let this discourage you! Continue!

I'm sorry for you. I know the feeling all too well. Two years ago I hat 1,5 out of 9 at Corus.
That was a long tournament! What you have to realize is that your result is as it is by the level of your opponents. You felt that you were playing stronger you said a few days ago. Trust your feeling, it's probably true. We already noticed you are a bit impatient. But improving in chess costs a considerable amount of time. Keep up the courage!

There is much more to the game than tactics. That's my main problem with MDLM's approach. His method does work, don't get me wrong, but it's only good up to a point. You also need strategy and a general grasp of the proper approach and conduct of the game. I recommended Chess Mentor to Pawn Sensei to accomplish just this. It helped me, and I think it (or some similar type software - perhaps TASC) would help you.

Hey, hang in there man. Yesterday I got smashed by guys rated over 100 points lower than me. Dropped my rating about 80 points in one day. And to top it off I used up all my time on my clock and they barely used any of theirs!

A good friend of mine once told me to take a week off from chess when I was in a funk. No chess, no reading blogs, no studying, nothing. At the end of the week I was ITCHING to get back into chess. Sometimes absence makes the heart grow fonder.

PS