Looks like your Dr. has check out your heart and does not feel that your right arm pain is related to heart or cardiovascular disease. Your BP is great now that you are on medications and good for you for getting your
cholesterol back in the normal range.
I cannot say what is causing your arm pain however an injury, muscle pull, or a pinched nerve in the upper arm region are some of the common causes of pain. Also anxiety and strenous physical activity may be your culprit which you posted you have both of these possible causes in your life.
Take care and I hope you find the reason for your arm pain.