Yep ,me !!! Infact on and off all day today. It sounds to me like you are describing benign ectopic beats, which I've had since my 30s. (now 50) They are often stimulated by a full stomach, indigestion or stress and anxiety, as the vagus nerve is near the stomach and holding it tightly can stimulate those flutters. I even get them when I wear a tight belt round my middle, when at my worst. Once the vagus nerve is irritated it can take a while to settle down. The heart pattern (presuming you have no other heart condition that you are being treated for ?!) you describe is when you get one slow beat and then your heart has to do some quick ones to catch up. At my worst a few years ago I was getting runs of them, like 100s of times a day.
I've had a terrible cold all week, coughing a lot (use of diaphragm) and also been very stressed by some mid-cycle spotting. So, voila, they are terrible today.