Very high resting heart rate

  I am a 41 year old male. Non-smoker, 6'4" tall, 245lbs, with no history
  of heart trouble. I am writing because I am experiencing a heart rate
  of 120 beats per minute while laying down for hours. I take no medication,
  don't drink coffee, and am experiencing headaches (pounding,pressure type).
  I have mentioned to my doctor several times that my heart rate is regularly over
  100 BPM at rest and he does not seem concerned. Should I be? I have slightly
   high blood pressure but once again my doctor says nothing. The fast
  heart rate worries me. Should it? Any help would be appreciated.
  Please send your reply to my E-mail address if possible!
  Thank you!
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[Cleveland Clinic, MD]

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Dear  Kevin,
Thank you for your question.  As you can see by scrolling through this site we get many questions regarding tachycardia and palpitations.  There are many causes of tachycardia and they can be divided roughly into sinus (originating from the sinus node or heart