My sympathies, Kelly. Been there, done that, bought the t-shirt (except I'm not in Med school yet). Give yourself a break. It's not the end of the world.
Have you talked to the instructor about your progress? Maybe he or she can give you some feedback.
Also, you may have seen this, but there is a test to see how you learn best: auditory, visual, etc. My English Lit professor gave us one this last semester and it was really eye-opening. It explained why it helps me to read my material out loud: auditory learner.
Through this simple test that you could probably get from an academic advisor, you can find new ways to study: Reading material out loud, taping the lectures and hearing them again, or taking advantage of the note-taking service (if there is one at your school).
I hope this helps.