My H was diagnosed some years ago. He had warfarin and then a cardioversion which ,for him, didn't solve the problem.
He was on warfarin until a few months ago when having been diagnosed with Alzheimer's ,and I had a problem with him taking them , the GP and I decided to stop them. I can't say it has made any difference.
The consultant ,when I discussed it said ,just get on and live your life.
That may not help but
I feel sometimes you need to take that advice and not overly worry.