I’ve got a similar screwed up heart issue and I use the Apple watch. There’s also the Fourth Frontier which I’ve been considering for a while which collects various different metrics about the heart.
The Fourth Frontier will work with your Android too.
I didn’t know that, good to know. The thing that put me off is that the app provides no analysis itself and you basically have to send the data to your Dr. That doesn’t really work in the UK.