I agree with Carey's response.
It's possible your are getting Atrial Flutter caused by the Flecainide. I would estimate that at least 1 in 4 people reporting on this site have had Flutter issues while taking the Flecainide. Also, it could be that you are just getting more AFIB, and that the Flec is not preventing it.
My experience from using Flecaide was that while it did help convert me out of AFIB, but it did not prevent AFIB, and I had many episodes of intermittent Flutter. It was much better to just take the Flec right after an AFIB episode, not all of the time. There is research that backs up this scenario for certain categories of Afibbers, but I don't have the time right now to find those references.