I don't know of any concerns with that (except maybe the reason Anti-Fib mentioned, but that doesn't apply to you).
There actually have been studies of antidepressant use with afib. An example is
here. Although the abstract starts off sounding kind of alarming, you need to read the whole thing. Down near the end of the abstract they conclude this:
Quote
This again indicates that antidepressants are unlikely to directly predispose to AF.
I don't think there's anything to worry about.