peach cat, Sorry to hear about your serious health and heart problems. I can sympathize with you since I have had to deal with the same issues as you, for the past 25 years, except for the hole in the heart.
I am 70. During the years that I aged from my fifties to my sixties, my health and heart got progressively worse. It took me years of experimenting, learning and frustration before I was able to turn my heart diseases around.
The significant improvements in my health came through a combination of very effective medications, very healthy diet, appropriate exercise; and the avoidance of heart stimulants and irritants.
If you are interested in how I was able to improve my heart and my health, please read my thread called:
What I have done to survive Heart Failure & AFib with a high quality of life.
at the following link: