I can t reach my doctor right now. The phone lines are overloaded. Last night my heart hurt every time I breathed. This has been going on, maybe around 5 am, nightly for a week, but last night it got so bad that I sat up and was sweating. After getting up, it went away in about 5-10 minutes. My theory is that this is low blood pressure late at night or very early morning, which causes insufficient oxygen to the heart, but why does it hurt more with each breath? I won t be able to see my doctor until Monday morning at the earliest. What should I do?