Dear patient, I suspect that it could be from a supraventricular arrhythmia, a small focus of cells in the upper chambers of the heart that fires when it gets irritated; alcohol, chocolate, caffeine and nicotine can precipitate paroxysms; they are usually benign and respond to avoiding the inciting trigger; if after doing so the symptoms persist and are bothersome, then consulting a heart specialist would be indicated. If you happen to have another of those episodes, you can go to an Emergency Department and get an EKG done, which would allow us to have a specific diagnosis. Truly yours, Dr Brenes-Salazar MD Cardiology Mayo Clinic MN