I have been experiencing symptons that have me worried. I have been to the doctor several times. I do not have high blood pressure, diabetes, or heart problems that they have discovered. However, I can feel my heart racing during the day and especially at night. Also, my heart will beat harder than normal at times. I also have trouble with pain in my left leg at times. My elbows are tender and I experience a mild tightening in the front of my neck. My doctor told me one time that it is stress, but I am not working or under any stress. I am worried because at night when I turn one way or the other my heart will race and beat hard. Has anyone had any of these symptons.