diagnosed hyperthyroidism severe chronic obstructive pulmonary disease copd experiencing shortness breath difficulty breathing significant way diabetes feel slightly dizzy lightheaded heart attack angina chest pain known heart defect feel heart beating fast racing irregularly missing beat feel palpitations traveled country last 4 weeks
psvt myocarditis guillain-barré syndrome atrial fibrillation scombroid food poisoning acute dystonic reactions myasthenia gravis anaphylaxis anemia sle chagas
Atrial fibrillation