I m a 35 year old male. 310 lbs. And 6 1 . I have diabetes and it is not totally under control. I have a high pulse, usually runs around 100, but my blood pressure and cholesterol are both perfect every time they re checked. I will go through boughts of chest discomfort and what I guess are palpitations. My heart beats fast and I am very aware of it in my chest, neck and left arm. There is slight pain on or around where my heart is. No slightness of breath. This can sometimes go on for days. Been checked by cardiologist and found nothing wrong, but the speed of the pulse and awareness of rapid and intense heart beats is very troubling. Any idea what s going on with me?