Does an arrhythmia usually make you feel short of breath and tired?

Yes. Due to heart not relaxing enough during arrthmia not enough oxygen coming into body so you can feel breathless.
Possibly. It's possible but many things can cause these symptoms. To check for arrhythmias, feel the pulse when symptoms are present- is it regular? Fast (well over 100 beats per minute)? Slow (well under 50-60 beats per minute)? If so than it's very possible that an arrhythmia is the source of the symptoms.

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