Does surgery really hurt?

God im so scared. Tomorrow, im having surgery on my elbow. I was tripped on concrete and I fractured my elbow. A mini bone in my elbow shattered off and its 2 millimeters away from where it used to be attached to. The surgery is one hour long. They will put wires in my arm. I'm so scared. Does surgery hurt during and does it hurt after? Please give me tips and info... :) Also, I will be asleep!