I get heart palpatations every day?

hello all , ive had palpatations for a while now and there getting worse, ive had heart scan and 24 hour ecg test ,, but i wasnt really getting them then ,, but it came back fine and for the past few days ive been having them non stop all day and all night even wen i go to sleep ,, i went to docs today and he said take propranolol 40 mgs once a day ,, .. will they help me and ease the palps off ,, im worried i will die from it ,, can palps kill u ,