“Can heart arrhythmia be fixed with a healthy lifestyle?”

Avoiding stress, caffeine, and alcohol can sometimes be helpful but medications and other treatments may be required.

Depends on what kind of arrhythmia. Arrhythmia is a very generic word that means "abnormal heart rhythm" there are at least 30 different kinds of abnormal heart rhythms. my suggestion is to see a specialist who will then order a monitor for a few weeks after which you would have a better understanding of what you have and treat it.