I am 50 yr. old female. I have MVP and have been on 25mg of atenelol 2x daily for years. I usually walk 30 min. a day. Yesterday I walked with a friend and it was actually close to an hr. I didn't have palpatations at the time but afterward I felt anxious and like I had the flu: achy, headache, lowgrade fever, sore throat. Later in the nite I did have some irregular beats and the feeling of my heart pounding. I feel a bit tired today. Did I just overdo it or is there anything to be concerned about these symptoms. I have been told in the past that MVP is nothing to worry about.