In atrial fibrillation, the atria ???quiver??? chaotically and the ventricles beat irregularly, causing such symptoms as a fluttering feeling in the chest, a racing pulse, low energy, a faint or dizzy feeling, chest pressure or discomfort, shortness of breath and anxiety, and in Clark???s case, an unusual symptom of tunnel vision when her heart was out of rhythm. click for moreTHE COREHome to our