From the start...I have been having pain that stars in my back, between my shoulder blades and left of my spine. it radiates into my chest and arm pit. This has been going on since Saturday. It's worse when I sit up or walk. This morning on my way to work it was so bad i stopped at my drs office and they sent me to the emergency room. i insisted to the nurse at the office that i thought it was my back but she insisted that i had all the typical symptoms of heart attack. thc cardiologist agrees with me. they have me scheduled for a stress test and an ultra sound to look at the valves. And arteries.