How do I recover a Microsoft Word Document?

Ok, it’s been a rough day. Tomorrow I have a somewhat lengthy Character Analysis due regarding “The Odyssey”. I would alternate working on it at school and at home, having a file on my computer and another on a USB drive. Today, upon finishing the paper, I wanted to copy it to my USB drive. I thought that I had been editing the file saved on my computer, but in actuality, I was editing the one on my USB drive. I closed the document, dragged it over to the Window for my USB drive, and without thinking, clicked “copy and replace” when the window came up. (The file names were identical). Now I am down to my introductory paragraph. I want to die. Please fluther, help me recover my document!