I also had episodes of atrial fibrillation in early 2019. Got stable with Flecainide and Metoprolol. Went through all the required tests for the Special Issuance. Once my Cardio Doc got me on the right combination of mg’s and stable in 30 days. My flight doc in OKC issued me my SI in a week.
I’ve had a renewal since then, and about to get one soon in May. The SI specification sheet outlines the reqs for your yearly renewal. Yearly 24hr Holter monitor and doctor’s note.
Good luck and PM if you have any questions.