Currently sat in A & E after GP sent me via ambulance due to horrendous pain in between shoulder blades and radiating toy chest and abdo. Absolutely excruciating. Had some tea and just waiting for th doctor now. I'm freaking out because they said th ECG said sinus arrhythmia. What is this?? I do have gallbladder issues but this pain is not from that. Does anyone know what it could b? Iv literally been roaring in pain since 12 o'clock.