How badly can it hurt?

Today I wonder how it feels to die from a physical injury, as if from a gunshot wound, stabbing, or internal bleeding. I think it would feel like I feel, but I don't know. I'm probably a very long way from death. There's no objective standard to measure pain, except to vocalize where your pain would rate on a scale from one to 10, one being the lowest and 10 being so bad you'd go to the emergency room. That's still not very objective. It's hard for a mind to focus, being in so much pain.