Tachycardia: It sounds like you may be having short bursts of tachycardia (likely SVT in view of your age). A heart rate of 180-220 is common, may only last a few seconds, and would produce all the symptoms you describe. Ask your doctor for a 30 day event monitor exam to nail the diagnosis. It's easily treatable. Meanwhile, avoid nicotine and caffeine.
Answered 11/17/2016
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