Thanks for all that. So, you do have AF. And, going by all that you have shared, I am all but certain that you are taking a DOAC (rivaroxaban or apixaban? Plavix?)
I couldn't agree with you more about self-education, even extensive note-keeping. And it's true, a GP is only able to give you maybe 15 minutes, especially in the socialized medicine systems. That may, with his/her good will, allow some dialog over two problems. Here in Canada, if you whip out a list, the GP will hold his/her hand up and say one item per visit (although truthfully they don't usually mind a couple of conditions).
As for any medication for arrhythmia, it depends on the arrhythmia and on the patient. Some can tolerate flecainide, some can't. Tikosyn (Dofetilide), the 'second strongest drug' behind amiodarone, must be started in hospital under observation, usually a two to three day stay. But there are others like propafenone (Multaq).
https://www.drugs.com/drug-class/antiarrhythmic-agents.html