I have this every single day, for most of the day. I have been having it for a long time. I have had 3 ECG's and a 24 hour monitor and it came back normal apart from a few skipped beats. I also saw a heart specialist and he told me he couldn't see anything worrying and that the skipped beats were normal and nothing to worry about.
Having said that it doesn't take the worry away from me, I think it is something I will always worry about and when I have a bad bout of them I really crap myself. It's hard to see reason so I understand how everyone else feels.