I've been taking your advice on technology for years and now hopefully you will take some of mine. I have a lot of heart disease in my family and the common denominator in long term mitigation is a change in diet and exercise. So follow your doctor's advice and pay special attention to their dietary recommendations. I won't get into detail as each person's case is different but there will be certain foods and habits that you will be asked to give up and certain foods and habits you should start. You would be wise to take their direction on that so as you will then have many more years to give us technology advice!
Also, read as much as you can on nutrition and diet in general. Many doctors still have old-fashioned ideas on nutrition so ultimately you need to listen to your body.
Get better and look forward to you being back to 100% health as quickly as possible.
Those were the doctors I ran into in the past weekend. . . Had I eaten what the hospital nutritionist sent to me as a cardiac diet (what they also referred to as a diabetic diet) I would have consumed almost 500 grams of carbohydrates in a single day. Breakfast was French Toast with genuine syrup, Orange Juice, a large banana, and three quasi-sausages made of some carb laden pseudo meat! No protein. Lunch? It was a nice crescent sandwich with low fat mayo (which to make it palatable, they add carbs to), rice (more carbs, a fruit bowl (more carbs), milk (yes, more carbs), noodle soup with huge noodles (even more carbs), and finally a fruit drink (yet more carbs!). Recall this was a diabetic plate masquerading as also a cardiac diet! My low carb diet is fewer than 60 grams of carbs!