Your blood pressure may considered normal if you do not have symptoms, as for ECHO it is seems that you are having borderline mitral valve prolapse
is a condition were the valve budges during every heart pump. So during which blood flow may be slightly disturbed inside heart which may cause systolic heart murmur
Usually no treatment is required for borderline MVP if it is symptom free.
But since you are experiencing dull pain during exertion, it is better to do a complete blood work up for cholesterol
Consult your family physician for further advice