I left class that day, walked across campus with the quiz in my hand, and found myself imagining my goals slipping away before I even got started. During the second semester, I sat crying in my prof's office over the D that I had just received on an exam. I'm actually a very strong person, but med school means THAT much to me. Of course, I worried about how drops look to admissions committies, but I just took the attitude that I'm going to keep on moving forward. I know you're beyond the drop period, so what I can tell you is that sometimes, science classes do get the benefit of a scale at the end of the semester.
Every teacher is different.
So hang in there, work really hard on the final. Don't give up on the class. You just never know what the prof will do in the end. Now the worst that can happen is, you get a poor grade in the class. OK, it's not ideal.