question: I am a healthy 51 year old white male. I run 2-3 miles 3 times per week. I weigh about 150 and I am 5' 11'. Lately, I've been having a heaviness in my chest with the need to burp during the day. Have also felt light-headed a few times. Last night the heaviness woke me up at 3am.I almost felt the need to call 911 for help. My resting heart rate is normally 60 or below and I have no symptoms whatsoever when I am running. I'm concerned that I have some type of heart problem. Can you help me understand what is wrong? I thought about hiatal hernia as pressing downward below my ribcage sometimes helps, but last night just seemed more intense.