Hi I am a 47 year old female one night my heart starting racing I was taken to hospital and spent the night hooked up to a ecg which they diagnosed A F Atrial flutter my heart rate was going up to 175 beats per min with chest tightness then it would relax and go up again. . I am waiting for a echocardigram and 24 hr tape . I have been put on beta blockers and already on warfarin for history of DVT. In the meantime almost every day I have been getting a vibrating sensation in my heart area almost like it's turning doing a somersault. I would advise anyone not to just leave but to get it checked out with your Dr and hospital.