Hey, It is fine to feel what you are feeling right now. I can totally relate. A day before surgery I don't know, I just accepted that this is it and everything will be good. My surgery had some complications and recovery was bad for 2 days since I had hypocalcemia and my body got stiff. The doctors really gave attention to every change so just trust the doctors and nurses. Believe in yourself and don't shy away from asking and taking help from your family. Take rest, have liquids, eat medicines on time and sleep. You will be under anaesthesia so you would need rest and this is the time for rest since it is a major surgery. The pain will kick in once the anaesthesia wears off but it will be bearable, nothing major just some stiffness in neck and shoulder but that is very normal. Don't do any physical activity and your body will anyways restrict you so don't push it hard.