I had open heart surgery for acute heart failure on May 8th. My mitral valve was replaced with a pig valve. Like you, I was terrified before surgery. As I approached the operating room (not in it) I was given anesthesia. The next thing I remember is waking up on a hospital bed. I had little pain and was taught how to get out of bed with minimal pain and without disturbing any stitches. I followed recovery instructions to the letter. Today, I have enough breath, can walk longer distances, and continue to be my disabled husband's caregiver. Be of good cheer. You will be amazed at how much better you feel after surgery.