One time at work I was moving a carboy (giant 5 gallon glass thing) and I set it down on the pavement a little too quick. It shattered and a shard of glass cut my finger straight through down to the bone.
At first I didn't feel it. At first, I was just looking at this flap of skin that was turning white. And then this rush of warmth came over me, drew the blood from all over my body and rushed it to the slice in my finger where it spurted out like a river. I got light headed. My face was warm, I paced around. I couldn't think. My whole body started to go into shock, seeing stars, heart thumping so hard in my head that I couldn't hear and everything went muffled.
All I could do was apply pressure to the wound and kinda retreat off to the side and say, I'm fine, I'm fine, I'm fine... even though I didn't feel fine at all.

That is how I feel right now. Cut deep and slowly going into shock.