Hello and thank you for using HCM. I carefully read your question and i totally understand your concern. But you should not worry. I will try to explain you something. This abnormal heart rhythm have to do with some electrical issues in the heart. Some electrical impulses that generate in a part of the heart different from normal sinusal rhythm cause premature heart contraction that you feel like skipped beats, abnormal rhythm. This might be just ekstra-sistolic beats or other different arrhythmia. The extra-sistolik beats generally are followed by a pause till the next normal heart contraction. If this are not frequent, in Young and normal heart, it is nothing to worry about. There are different factors that might cause this skipped beats or arythmias like emotional stress, excessive coffee consumption , coca-cola or energy drinks, so you have to avoid them. As you explain, you are under prozac, an antidepressant medication. It is quite known in medicine that stress disorders might cause high frequencies, exra-sistolic beats. All sow pathology like anemia or hyperthyroidism might be other causes of this rhythm issues. So, if I was your treating doctor i would say that you have nothing to worry if this happen once a wile, its normal because of stress or coffee usage.But if they begin to bother you and interfere in your live we can decide to do some examinations like a blood analyze, your thyroid hormones, an electrocardiogram, echo-cardiography and of course a holter rhythm monitoring to have a full view of your rhythm. Only than we can decide what we should do. Hope I was helpful. Best regards.