I had gone to the doctor approx. 5 years before, because while i was still in high school, while walking to class both of my calf muscles seized up and i was having a difficult time walking. by the time i had made it to class my left arm and my chest also had sharp stabbing pain. when i went to the doctors she did a blood test and a chest ex-ray and told me i was fine.last year had gone to the doctors after feeling like i was having a difficult time breezing. it would feel like someone was sitting on my chest,and was have a lot of palpitations .. I was diagnosed with a heart murmur, described as "one of my valves not closing properly" , I was also told that my cholesterol was fine,But I was recently told by a customer of mine that there are degrees of heart murmurs. so my question is it is true and should my doctor have told me that? and i also wanted to know if my earlier episode could have been caused by my murmur and if it could be a sign of something more serious.