Extremely stressed. Help?

I'm extremely stressed right now. I had quite a bit of homework igned today and due tomorrow. I've had more homework before and dealt with it, but right now I'm stressed as hell. I've thrown and broke 2 pencils, snapped a mechanical pencil, pounded my fists on text books, and thrown my workbooks across my room. Every time I start any subject, I barely get anywhere. What should I do?