My brother is an instructor class in scuba diving and we have a family history of heart disease, but as yet he is unaffected, apart from high blood pressure, which he takes medication for. I believe the club should instruct you what to do. He had to obtain a medical certificate from his Doctor to state he was fit for diving. Without the letter, he could take no lessons, let alone diving exams. I know in some spanish resorts etc, they let you pay a few euros and out you go, but these are not following strict regulations.
My brother has to get a medical every year from his Doctor to keep his licence.