I am sure these are exactly what you think they are,ectopics or extra beats. Most people get some,the problem is when you become aware of them and they produce anxiety
as in your case.
In fact as I am sure that you have been told they are both harmless and require no treatment. They can however be suppressed by either beta blockers or anti-arythmic drugs. Most cardiologists advise that the risk benefit ratio is in fact against treatment.