Ive had a couple of episodes recently where I become very dizzy.  Feel Faint and have to sit down.  I have arrhythmia and problems with my heart staying in rhythm ( had ablations and cardio-versions) and take flecanid and pradaxa.  After a couple of minutes it passes.
Hello. Thank you for asking us. Flecainid is a Chat Doctor.  I would be more comfortable to comment further if I would have more data (like an EKG during the episode), but I would recommend you to consult with your treating cardiologist about the possibility to substitute flecainide with another