When I was a child, I was sickly, overweight( due to the fact that I was sick in bed for a good two years of my childhood) and had heart problems. I'm much healthier now then when I was a kid. I exercise, eat right, and stay active, but I still have heart problems. I worry that my pacemaker is going to malfunction or something and my heart will stop beating in my sleep. I get chest pressure and my heart sometimes beats fast for no reason. I've been to several doctors and they always say I'm fine, but I still worry. IIN to worry so much about dying in my sleep?