I'm sorry for all your concerns.Been there, done that!.
I had AFib for almost 2 years and was on the highest dose of beta blocker the cardiologist had ever prescribed...but anything less and my heart went into a tailspin of constant irregular beats. But then I cured myself. The cardiologist said that it was impossible. But here I am years later with a steady heart. HOW I cured myself made me realize that WE have power over our medical conditions. We don't have to resign ourselves to the mercy of Big Pharma. Many people just do as their doctors say without question. Bad idea! One needs to take control and be involved themselves by becoming informed and listening to what their bodies are telling them and making lifestyle changes.
I just came back from 2 weeks in Holland where you don't see ANY overweight people. None! Most people are not even what we call normal weight. They are all slim...and beautiful due undoubtedly to excellent health. Why is it so? They bicycle and walk everywhere. There are 2 bikes for every Dutch person. No one drives a car in Amsterdam because first of all it's too slow compared to a bike. Hordes of people with babies and toddlers on board (without helmets) ride to and from work and daycares every day during rush hour. Elderly people go shopping by bike. It's inspirational! We should follow the Dutch model and get out there and MOVE. I don't know whether you do but I certainly need to do more. A Fitbit makes me accountable. (Again, taking control of my own health!).
How did I overcome my Afib, the most serious case my cardiologist had ever seen? I took control of my own health. I joined a gym and went 6 days a week. Within a month, I lowered my dose gradually of beta blocker which the cardiologist wanted me to do. I kept this up for 4 months, going to aerobics and strength training classes every day but Sunday. But very important to further take control of my own health: I stopped all stimulants; coffee, tea, alcohol, decongestants, chocolate etc.. Here I am today 24 years later with a stable heart. I do have to say that if I cheat and have a coffee (2x per year) or a chocolate, my heart races or gives me thumps. I consider it a warning and listen to my heart which is sending me a message loud and clear.
I hope you can do the same.