Just experienced my 3rd bout of afib in 3 years. Unfortunately, my afib meansheart rate above 180; hospitalization, and cardiovert; although I put myself back into rhythm after flatlining for 12 seconds. Consequently, The doctor increased my flecainide rom 50 mg 2 X a day to 100 mg 2X a day. Has anyone experienced side effects from flecainide??? I am concerned about the increased dosage. Any advice?