
I have never blacked out, and the few times I have been dizzy/ligh-headed were when I was on a high
dose of
Metoprolol, I was as high as 200 mg a day. I've just today dropped from 100 mg to 50 mg, and will see how my HR reacts.
Some of us AFib'ers are "lucky" symptom-wise, unlucky treatment wise, e.g., my EP and my cardiologist both advise against trying an ablation, which has some risks, especially for AFib and the required entry into the left atrium from the right atrium.