HELP MY BRAIN IS ROTTING

I haven't been able to study properly these days, nothing gets into my head, I feel like I'm reading alphabet soup. 

I honestly think the problem is my study method. I can't seem to stick to the material; it simply doesn't make sense. Today I tried to study for a chemistry test and I DIDN'T UNDERSTAND IT AT ALL AND THE TEST IS TOMORROW IT'S IMPOSSIBLE. 

AND I HAVEN'T EVEN TALKED ABOUT THE WORST PART, TODAY I SPENT ALL DAY PRESENTING A BIOCHEMISTRY WORK AND THE DAY BEFORE I HAD ANOTHER TEST, MY BRAIN JUST ISN'T WORKING ANYMORE, I DON'T PAY ATTENTION TO ANYTHING, I'M TIRED.

Well, the fact that this doesn't bother me as much as it should is bothering me, I'm in a paradox here, while not understanding the material is fine with me, I feel uncomfortable precisely because it doesn't bother me.

Anyways, someone tell me there's a solution for this before I drop everything and go live in the woods.