I have had a few of those days. Unfortunately, I have no idea of how to analyze my games, and I do not know how to learn to do so. Therefore, it is a bit hard for me to learn lessons from the games. I seem to be improving, but I have no idea why.
Can't Buy a game
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I think we all go through it, it's like a writer's block. The best thing to do in my oppinion is to not play while you feel like that. Take your mind off the game, have a break, watch a documentary, or sleep and come back with a fresh new mind. Works like a charm for me every time 
Have you ever had one of those days when you just can't seem to win a game?One of those days when it seems like you just learned how the pieces move.