Hello and thank you for using HCM.I carefully read your question and I understand your concern.You shoud not worry,its nothing serious. As you describe,my opinion is that we are talking about extrasistoles.This are electrical impulses that generates from different parts of the heart different from that of a normal sinus rhythm.This couses an ectopic heart beat that you feel like a skipped beat or as a palpitation. There are different reasons that may generate extrasistoles.From simple emotional stress to anemia, hyperthyroidism ect. If you tell me that you have done your blood analysis than we have excluded anamia.I will recommended you to sample your thyroid hormons.Hyperthyroidism may cause extrasistolic beats.And of course a holter monitoring.Your electrocardiogram might be normal becouse extrasistoles are random but a holter monitoring gives a full monitoring of 24 hours to see your rhythm tendency.At mean time avoid coffee and caffeine products because they exacerbate your simptoms. My opinion is that you should not worry.Sometimes only a simple stress can couse this extrasistoles and in young age this are quite normal. I hope I was helpful.Take care and wish you good health.