Hello. Thank you for your question. I understand your concerns. According to the description of a great pressure difference and the positioning of the murmur in diastole, there is a good probability that you have aortic regurgitation (condition where blood returns from the aorta into the left ventricle in that part of cardiac cycle when aortic valve should be closed - diastole). I recommend that an echocardiogram should be performed to assess if this diagnose is present, if present - what is the severity, then we could give more recommendations regarding the treatment. I hope I was helpful. Feel free to ask again