Scared to start propranolol, read it can cause heart attack and death. should i be concerned at my age?

Propranolol: "Abrupt cessation of propranolol therapy may result in hypertension, myocardial infarction,& angina pectoris in some patients." < than 0.1% for Anaphylaxis. REF: https://www.drugs.com/sfx/propranolol-side-effects.html ** Propranolol Overdoses have caused death, seizure, cardiovascular collapse, hypoglycemia, coma & respiratory depression. REF: https://www.ncbi.nlm.nih.gov/pubmed/866746