Surprised that with your heart history that you were able to drive.
When I had 2 “fainting fits” my cardiologist told me to inform DVLA and give up my license, as he was obliged under the law to enter it into my medical notes and were I to have an accident, I could well find myself both uninsured and driving illegally if I hadn’t informed DVLA as fainting is classified as losing consciousness and is a reason that DVLA rescind your license and insurance won’t cover you.
I had to get a letter from my cardiologist after a year of not driving and no more “fainting fits “ before I could re apply for my license.