Hi, I have iron deficiency anemia from very heavy periods (fibroids). Lately during periods I ve been getting sudden palpitations/sinus tachcardia, lightheaded, short of breath and chest/back pain. Blood pressure also spikes. Episodes last about 10-30 minutes. I ve been to ER 3 times and although my hemoglobin is always around 10.4-10.9 when these attacks happen and always during active bleeding, ER says the anemia isn t low enough to be causing symptoms. It is terrifying. They tell me it s probably panic attacks. Cardiologist is having me do some tests (event monitor, stress echo) but EKG s are always normal except for sinus tach. Can mild anemia do this?