I have atrial fibrillation with very bothersome symptoms and started flecainide 3 weeks ago and sine then have had terrible side effects including dizziness, some nausea, unable to stand for more than a couple of minutes, extreme fatigue. I am now trying a different drug which has worse nausea side effects, some fatigue, etc. I am suffering with these side effects and there cannot return to work yet. Both, however, do relieve afib. Not sure whether to stick it out or explore other options (ablation) I am 68, female.