My other half had something similar, and they had to go in and do an ablasion (sp!?) to "burn" the extra circuits in his heart so that it would beat normally. I can relate to the weird breathing feeling as that happens to me sometimes. However, it is often related to caffeine for me. We also found out after that fact that it was much more the caffeine and stress for him too. He got fired from the job he was at and has had almost NO heart problems since.
Coughing will sometimes help it go back into the correct rhythm (deep chest coughs), sleeping, or even going to the bathroom. All of those activities change the pressure internally, and can help the heart find the right rhythm.
It is scary, but in a way it isn't that threatening.
Glad you're doing well!!