Eliminating these provoking causes can often dramatically reduce the frequency of palpitations. Given that you're 22, healthy, and had a negative stress test, I suspect that your palpitations are benign and are not indicative of any underlying cardiac disorder. Thus, I suggest that you eliminate the aforementioned causes of palpitations and see what happens. If nothing changes, then you should see your physician again. I hope you find this information useful.
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