I'm on 5 mg Bisprolol for AF, along with Apixaban, 40 mg statin and 100 mcg Eltroxin (after total thyroidectomy). I've always been energetic- I had an overactive thyroid for years which might have contributed!
I was worried that my energy levels would change after having thyroid out, but I noticed no change, apart from relief of symptoms of very enlarged thyroid.
Then, when diagnosed with AF and prescribed beta blocker, I was nervous that it would slow me down, but no effect!
When I have an AF episode, every few weeks, I feel a bit tired but most of the time I feel almost exactly the same as before I took beta blockers (and other meds).