the physicist's anxiety

I've never experienced an anxiety attack before, but I think I'm feeling a small fraction of what they are like. In one hour I will be taking a two hour physics test that counts for a third of my grade. My heart is being compressed by the fluid pressure I'm learning about but not the atmospheric pressure unless there's a hole in my chest. The guage pressure is about to exceed the max my heart can hold because I ate a few fries at lunch so the area of the arteries are smaller. My back hurts because the closer I hang my head down to my paper, the larger the torque is, pulling more on the muscles that run down my spine. The temperature changes in my room are stretching and compressing my brain due to the heat expansion theory. My heart is beating at a few hundred beats per minute, and if a small object traveling at a large velocity were to inelastically collide with it, the lost mass would be neglectible but the velocity of my heart moving with the small object could be found using conservation of momentum, not conservation of energy. I'm so afraid.