Middle back pain, between shoulder blades
Do not try and convince yourself that discomfort in your chest is just heartburn. Do not try and convince yourself that your high heart rate is something you can figure out later. Both could be warning signs that you have a heart condition or you could be having a heart attack.
The fix: If you have any of the following symptoms, call 911 right away. Quick treatment could save your life.
Below is a fun video and very informative.