What Causes Sweating And Dizziness After An Injury?

today, i cut my finger at work. it was a deep cut but nothing requiring stitches. while a co worker was helping to patch me up, all of a sudden I began sweating profusely, all the color drained from my face and i looked as if i hadn't slept in years. then i felt was if i was going to black out and finally, i felt like i was going to lose control of my bodily functions (bowel movement, urination). I spoke calmly to myself and focused on not passing out and shortly everything came back to normal. I felt a bit queasy for a bit but soon everything settled. I didn't loose that much blood, although I hadn't eaten breakfast. Nothing like this ever happened before. Do you know what this was? and why? I'm not even scared of the sight of my own blood, etc. I have had plenty of nicks, gashes, stitches before but never had an episode like this.