Hello, I am a 36 year old woman who is 5'11" 200 pounds. I have been diagnosed with endometriosis. Lately I have chest pains, heavyness, and shortness of breath at the beginging and after my period. Most of my chest pain is on the left side, sometimes travels to the right. Almost constantly shoots down my arm. It happens a lot when I run after my first 2 miles. Is this my endo or an anxiety attck. I don't feel a sense of doom just annoyed that my day is screwed! Which is it?