Hi there.. I can understand your worry.. atrial fibrillation is abnormal heart rhythm.. causes could be many like congenital heart disease, hypertension, rheumatic fever, obesity,
thyroid probem, excess alcohol intake, cardiomyopathy.. symptoms include palpitations, chest pain, giddiness, breathlessness.. treatment includes medicines like anticoagulants, anti arrthymic agents.. please consult nearby cardiologist soon..