Feeling crappy...

Hey Kid, like everyone says, it's a bump in the road. It's a big deal now, but after you've got your degree, you'll almost have forgotten the grade on this test. Your degree doesn't throw up a red flag saying "Kid Bombed His Calc Test!" And bjkadron is right, when I had a problem in college, if I approached the teacher during office hours and showed him or her in earnest I really wanted to get this stuff figured out, they always helped me.
Best of luck!!!