I have a pacemaker, now get a light and floating feeling in my heart?

My background: 7 years ago I found out that when I pass out my heart completely stops, so I was fitted with a pacemaker. Since it was fitted I sometimes get a strong fluttering feeling in my heart, which I’ve had checked out and is nothing to worry about. However, in the last few weeks I’ve been getting a different sort of feeling in my heart. It’s very hard to describe, but I guess it feels like my heart’s very light and floating. It only lasts for 1 heart beat or so though. It’s been happening quite often in the last few weeks. Any ideas please? Thank you.

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