For me the worst part of surgery, is waiting to go into it. Like Ugly said, nowadays some surgeries are minimally invasive. I had a hysterectomy done for my uterine cancer, and they cut 4 or 5 tiny cuts in my belly.
Ever had sciatica?? I have, and there is no pain like it. If I can handle the indescribable pain of that, then YOU CAN take the pain of recovery after your surgery.
God is with you, so why worry? Don't feed the devil.. He thrives on fear.
Go read my physical pain testimony, under the Blog tab in my profile.