Nothing's Getting Done

Everything; my schoolwork, my friends, my family, my health. I'm being so overwhelmed by it all that I'm past the point of getting through one thing at a time. Today I just stopped. I've never been responsible for so many things at the same time before and tonight I just couldn't go on.
Lying face up, too tired to close my eyes and beyond comprehending thought, I stayed on the floor for almost an hour until my brother came home and I remembered what was going on.
I need a better way to deal. It's getting scary.