I never felt so stressed before. And I am so stressed doing this 3 minutes powerpoint presentation. I spend endless days trying to fit theories into this person. But it just never seemed to get it right. When can I stop doing all this?

I have one essay, one lab assignment to be handed in, one midterm to prepare for. And one more presentation script to be prepared and handed in. Now, everything was stucked because of this presentation... and I am so helpless now. Who can I turn to for help?