I have had my heart skip a beat.. It will beat consistently and then all of a sudden it will stop.. then it will continue to beat  and then stop.. When it stops I feel a flutter sensation.  I tried to back off on the caffeine..  It seemed to subside, but I am concerned as it still is doing it.  I dont have the energy to want to work out and I find Im tired quite often.  I went to a cardiologist a couple months ago, and he did nothing.  Of course, my heart was beating just fine then.  My cholesterol is 205 and I am working on diet to bring it down.  With oatmeal and flaxseed every day.  I am 60 years old and I would think there would be some tests to make sure my arteries are not clogged.. I am not sure what to do next..
Continue your lifestyle modifications. Get EKG and holder monitoring for looking at number of events of missed beat. Also get 2d echo to see the heart anatomy. Probably this will help to diagnose.