I am 31, 6ft 2in and about 220 pounds. I have low blood pressure and a good heart rate. I had my bloods checked and everything seems healthy. However, I sometimes have very fast, irregular heart beats that I feel go up into my throat. Each episode lasts no more than ten seconds and have occurred four times in the last six months. I lift heavy weights but have had only one episode while doing weights. I have an irrational fear of dying in my sleep and death in general. My job is quite stressful and I have had marital issues lately.