Resting Heart Rate 130-160; Thoughts?

Hello! I am a 22-year-old otherwise healthy female. About a year ago, I was getting some routine blood work and the physician noted my heart rate to be elevated to 135 at rest. I monitored it throughout the next year or so, and this seemed to be a common thing. At rest, I would frequently find my heart rate to be between 120-140. A couple of months ago, I was sick with a stomach flu. After 2 weeks of nausea and diarrhea, I went to an urgent care. They referred me to an emergency room, as my heart rate at that time was 155. It remained 155 in the ED, after fluids it improved but only to 125. The ED physician was very concerned and prompted me to see my primary care physician as soon as possible. I had some blood work done at the time, not too remarkable - elevated lactic acid, elevated platelets but everything else was within normal values. I saw my primary care physician the following week, and he did an EKG and TSH - both normal, other than sinus tachycardia on the EKG. He told me not to worry. My parents remained concerned so I saw another primary care physician in September of this year. They gave me a 48-hour Holter monitor. I recently received the results, and they informed me that the only abnormality was the rate, often times reaching 160. For some extra reference, I am very active with a healthy diet. I am not anxious or stressed. I am asymptomatic for the most part, but I do experience some occasional light headedness and shortness of breath, but I am generally able to exercise without a problem. I'm not sure if it's relevant, but I also have increased fatigue and very frequent headaches. Should I seek further follow-up about this elevated heart rate? If so, what would you suggest? My primary care physician who ordered the Holter monitor also did not seem concerned and did not suggest any follow-up.

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