save,
Its impossible to comment on the neccessity for something as complex as open heart surgery without looking over all of your data in detail. Generally, symptoms are associated with a significant increase in mortality without intervention in the disease process of aortic stenosis. If you are hesitant, a formal second opinion might help you ease yyour fears. The Cleveland Clinic has excellent cardiolgist that specializes in aortic valve disease that would be glad to see you in consultation. There is also an internet consult service through the CCF website.
good luck