As the title suggests, I feel really depressed because of my bad performance in the recent div 3.

For some context, I just got +83 from the last edu round, bringing my rating to 1492. I was really hoping that the recent div 3 will bring me to 1500 for the first time because I never solved less than 4 problems in a div 3 and all I needed was a +8 delta.

And then I failed miserably. For some reason I was so incompetence and acted like a moron throughout the contest. My hands got clumsy, my brain slowed down and became stupid, my code was messy and I felt really frustrating. In the end I finished the contest with 2 problems solved, lost the chance to reach 1500 and probably my specialist rank (great, just when I thought that I was finally improving).

Is this kind of behavior (i.e become a massive idiot in the most important moments) normal? Should I convince myself that it's just a bad day? And what should I do now that I'm basically back to square one?