Well the basics of being in persistent AFIB, would be Anti-Coagulation, HR control along with monitoring Blood Pressure.
Sounds like you are on Eliquis, and your HR is normal while in AFIB? How is your blood pressure?, as the Propranlol lowers BP.
Hopefully, as long as your HR and BP were in range, your body would compensate for being in AFIB, and you would feel better as time went on. AFIB affects breathing, oxygenation of the blood, and the nervous and endocrine systems. Over time your body may handle this better.
People often have to adjust and change medications to help them cope. It's possible the Flecainide is causing some of the "When it occurs I get shaky, weak and tired". Do you just take the Flecainide when you get an episode?