For the last two weeks I have had heart palputations off and on. Last night when I was lying in bed to go to sleep the following occured: 1. heart racing 2. dizzy 3. nausea 4. uncontrolled shaking 5. breathing difficulties (not able to catch a good breath & rapid breathing) 6. Not able to sleep. Today I am feeling these symptoms: 1. shortness of breath and discomfort pain around my left breast. Is this just anxiety?