A friend of mine did have complications during a C-section, they cut her bladder by accident, and there was an emergency. (good outcome though, mother and baby okay). But, two years later, I found myself in the situation of having an emergency C-section and had to sign the consent form - no choice really - and they read out the possible complications, including the damage to bladder risk, and I knew, because of my friend's experience, that it is a real risk, as in, it does actually happen, sometimes.
So yes, I do understand the anxiety. However, I suppose I had the knowledge that although it had happened to my friend, they managed to save her and the baby, and the outcome was good in the end.
I had nothing untoward with my operation, and despite it being an emergency, my baby was okay, and so was I, despite the shock and stress of it all.
I'm sure you'll be fine. Remember these surgeons are experts, they do it every day.