over-tired, over-thinking, and over-reacting

I'm crying right now over an assignment for one of my classes - something I don't ever remember doing. It's not even June yet and I'm already completely overwhelmed. What made me think that I could fit in a couple of classes and work full time? I'm pretty sure I also have bronchitis. Gosh, I sound so pathetic.

Lord, I need you. Please help.