'I know that I should forget, but I can't'

Will somebody please explain what goes on inside my head? Like, before I go completely crazy?

I just feel like I can't do anything right. I can't play my study properly, which makes sense, considering I haven't actually done any work on it this week, I can't even get up as early as I want to. I don't want to sit in a boring Asian Studies lecture about even more stuff that I'm supposed to be remembering. Nor do I want to sprint between classes, and end up flustered every time. Sense of deja vu here from last week, essentially. Even though I am, once again, making progress on this assignment.
I know this is stupid, that I will be fine, and that this will only last for a little while. This rational part of my brain hardly ever wins though - no matter what I do.

I need a holiday. One where I can actually relax.