At the expense of being called repetitious , I submit that the best answer to your ( legitimate) concern is a Medic-Alert Foundation bracelet or neck medallion. It carries your name, basic info, e.g. Diabetic, An ID number and a foll free telephone number. You pre submit the medical, personal , doctor, hospital & insurance data with Medic-Alert. Once telephoned and given your ID number, the Foundation gives the caller the submitted info. That is as secure as it gets, without becoming unusable in an emergency. EMS personnel know to look for it. They also supply a wallet card with some additional info. They are a not-for-profit and have been in operation for at least 50 years. Usual disclaimer. Only a satisfied customer