Mary ann - My husband has major heart failure, very very ill, 6 years ago not expected to survive, letter to GP tells him less than 30 days.
Every six months the heart hospital does, ECG, and echocardiograms, the results of those allowing for a 10% operator variable on echo, the specialist tells us weather he is getting better or worse.
I have learn't to read the echo over the operator's shoulder and even I can tell if the results are good or not so good, but I have not been formally trained in any way.
If you have had all the tests you describe and they are clear it is highly unlikely you have a heart condition, as another suggested winning the lottery rare at your age.
Husband 59 when diagnosed, condition came on very suddenly, over a couple of weeks, shortness of breathe, and couldn;t walk up a flight of stairs whithout getting dizzy.
Then collapsed at home, very sleepy, appeared to be dropping in and out, did not answer me when I asked him questions, sitting in lounge chair, could not stay awake, mid afternoon, sweating up a storm, looked as though he had just walked out of a shower, T shirt he was wearing was soaking in a few minutes.
I did not understand what was going on so rang for an ambulance, they took his ECG and told me they were transporting him to the hospital, he was very lucky, he had congestive heart failure the day he was taken to the hospital, lungs full of fluid, medication given to him made him pee, three bottles later, I was the one passing him these bottles, admited to the ICU heart unit.
Cause of his condition unknown, probably a virus I have been told.
He has dialated cardiomyopathy, with a left branch bundle blockage that has advanced to a right branch bundle blockage, and then 100% branch bundle block,
1 year ago they installed a three lead pacemaker that makes his heart beat. This last week he has mowed our road verge as well as the neighbours, weeded, planted about 20 plants we have grown on from cuttings, picked up three mini trailers of hourse manure on our five acre block, used for our gardens after composting.
An energizer bunny unable to kill I'm afraid.