Honestly, the death rates from undergoing surgery are truly substantial, I'm not going to lie about that one. I hear a couple stories a year about deaths from boobs jobs, rhinoplasties, liposuctions, ect ect, and it usually happens when the patient happens to swallow blood while asleep, or if the doctor hits certain veins or causes certain infections that travel through the bloodstream and things faster than normally. It does happen, and a bit more commonly than it should, in my opinion.
With me, I have indeed had dreams that have come true in exact form (one time, I predicted the exact school schedule of my best friend, down to what teachers she would have, what periods she'd have the classes, what classmates would be in her classes, all based on a dream - and it came true entirely, 100%.), it's hard to know if your friends dream was anything worth paying attention to. It may be just that she was already scared for you and had you on her mind, and it caused the dream.
With any surgery, just make sure your surgeon (has the knowledge and maturity to) explains the entire spectrum of risks, including what could potentially cause death. My first rhinoplasty surgeon operated on me because he convinced me the surgery literally had no risks one should worry about, yet my result came out maimed and deformed. You really got to make sure your surgeon is the right choice for you, and that he takes his job very seriously. You also should meet the anesthesiologist before your surgery, and ask him about his profession, experience, and risks as well - he literally holds your life in his hands.
