Panic

WARNING: Blatant self-pity to follow; proceed at your own caution.
I am a confirmed procrastinator, no doubts about that one. I waited until the day before my scientific paper was due to write it - and I think I did all right. But the paper took me all of 10 hours to write - and that's fast for me. Now, I have a physics test to study for, and I am scared. I always get nervous before a test, but physics scares the hell out of me, and I haven't had a chance to study yet, so now I have 12 hours before I'm going to take the exam and I'm trying not to work myself into a panic state. Seriously, my heart starts beating really fast, I start breathing really fast, my hands are shaking, my palms and feet are clammy and ice cold. I'm nervous. I have mammoth butterflies in my stomach, and my whole body periodically starts to shake, and I feel like I'm on the verge of tears and great gulping sobs. I don't know how to counteract this, and I really hate this feeling. But, I get it no matter if I study in advance or not. Maybe they have medication for this, I don't know, but I don't think this is right. So, I am going to do the only thing I can do -study, and do my darndest to try and calm down. Wish me luck.