My husband has to get a testicle removed due to precancer. I am worried about the surgery. Can I get some uplifting words?

I'm really nervous about this surgery. I am an overthinker and a worrier. His surgery is coming up in a few days. He's had surgeries in the past before when he was younger that required anesthesia, and he almost didn't wake up. They have to put him under anesthesia for this surgery. We're going to tell the doctor about his history, but I still have this annoying voice in the back of my head saying something could go wrong. I have generalized anxiety disorder, so I've been worrying myself sick these past few days.