I am 23 years old. Have been weight lifting for about 7 years real hard with heavy weights and little aerobic exercise. In the last 4 years I have experienced disturbing palpatations, transient and slight SOB, and irregular hearbeat especially when I lie on my left side. In the last 10 months I began an aerobic routine of running, I have heard on many occassions, a audible clicking noise immediately after I stop running or when I 'bear down' during exertion. I went to my doc who ordered a echo (the kind that went on my anterior chest, I think that's a 3-d) a 12 lead was done that showed a NSR and a holter monitor. The only thing the echo showed was that my left ventricle diastolic diameter was like 0.2 above the normal range, everything else was negative except it did say my left ventricle was vigorously contracting. My insurance was dropped and don't know the results of my holter. I haven't been back to this doc. I am concerned about the clicking noise and what it could be since it has increased in frequency lately. My BP is extremely labile whereby I may be 160/110 one minute and 110/70 the next. My pulse is slow 45-60 always has been since high school. I do feel tired often however, this is hard to judge since I work night shift and am often sleep deprived. I exercise well without chest pain or any near or actual syncopal episodes. I adapted well to aerobic exercise and run 6:00 miles. History of MVP on mothers side. My peripheral pulse is visible and bounding especially my left carotid. Is there any chance this is normal or does it sound serious. Thank you!