two points are very important here. they are abnormal heart rhythm and tiredness. which type of abnormal heart rhythm are they trying to treat with propranolol? it seems like you have supraventricular tachycardia and the type depends upon the ekg and ep study. did you have any of these? the tiredness is very classical with propranolol. how much are you taking? the other possibility for tiredness could be viral myocarditis which could be seen on the echocardiogram. revert with the details to an internal medicine physician online --><link>
could you advise on my tiredness weakness and faint feeling following viral infection?