narrowing of pylorus

iI have been told I need surgery because of the narrowing of the pylorus. the pylorus area is weak and continues to narrow. I had a scope done to expand the opening once since it was totally closed.since then there were two other times that I had severe pain,went to emergency room. In addition there are many times I have severe pain that lasted two to six hours and keeps me up at night. I was told that my condition will not improve and I should have surgery now before it becomes an emergency.my question is what kind of surgical procedure is needed,and how risky is it.Im 61 years old and in good health otherwise.