Aching after AF episode

[MummaG24]

I was taken to hospital at the weekend with AF. I’ve had flutters before and 2 previous episodes where I ended up at A&E. I’m 45 so it’s rather unusual and each time has been triggered by headache & vomiting (possibly a migraine). I feel completely fine but I’ve got a ache in my chest. It’s not all the time. I’m thinking it’s like I’ve pulled a muscle!? The heart is a muscle after all, could it just be from this particular episode? All tests were normal and I’m on beta blockers until I get an appointment with cardiology. TIA