I have the same thing at times. Sometimes with a panic attack and sometimes out of the blue. My heart rate will be 97 to 100 bpm and doing nothing and have shortness of breath and my BP will be higher than normal. I also notice little nagging chest pains once in a while. I am going to the doc on Monday to get bloodwork for silicone levels, that could have something to do with it. I know the feeling. I wonder if it did heart damage to me as well.