I'm 63 and have had afib for 2 years. My "attacks" were becoming more frequent every month. My heart rate would go to 150+ and stay there for 20 -30 hrs. When it returned to normal (60 bpm) I would just be drained for the next day or two. Most of the drugs had adverse side effects. None of them stopped the afib. Doctors warned that it would become progressively worse. Last month I had a pulmonary ablation. You'll become familiar with this term. The jury is still out. I'm told to expect more attacks for the next few months. Then, if successful, I should be drug free and unlimited in my activities. I've always been a physical person and I'm not ready for the rocking chair.
Get a good doctor (I went through several), research, and educate yourself. Afib can be scarey and depressing, but it can be treated.
BTW I hope you have good insurance. My ablation ran close to $100,000.