Most people who experience ectopic beats describe them much as you do. They are not "skipped beats", but are premature beats, occurring before the next normal beat, resulting in a longer than usual pause before the next beat, which is then more forceful. The sensation of the "skipped beat" causes what I call a feeling of dropout, sort of like getting the breath knocked out of you, but much milder. It is that sensation that I think makes you feel as though you are faint.