I wont be able to help you much because I am not too familiar with all this. If you have only been to one cardiologist, you may want to visit another one to get a second opinion and he can do the same test on you as the other doctor. pcvs can be normal I know as long as there are no more that 5000 in like 24 hours I think. I have some abnormal heat beats. I have mitral valve prolapse(I was actually born with this and I found out a month ago I had it) Some of my symptoms I was having lead me to the doctor. It is nothing serious and they tell me I will not die or have heart attack. My heart rate beats real fast and also I get the heart palpitations. I mean my heart would beat really fast sometimes for no reason. It is all due to the MVP. It is very normal for me and they said that no matter how fast it beats it will not kill he or damage my heart but I could faint would be worse case scenario. Some of your symptoms sound like mitral valve prolapse symptoms. Weird. I know you must be very concerned. I would take this seriously and get a second opinion ASAP. Do not stress yourself out too much but since they are talking about your heart I would see another cardiologist and see what they say and go from there. I hate that this is happening in your life but I am sure you will get the right results you need and you will do what is best for you. I know this day in time these doctors can do so much to help with heart issues. I hope someone comes along and can give you better advice and answer some more of your questions.