Hi, I have gone through your medical history carefully and understood your concerns. Having difficulty in breathing with a rapid heart beat is indicative for possible: - arrhythmia (tachycardia) - associated with angina (or ischemic heart diseases). Further investigations are needed to determine the right cause including : - ECG - cardiac echo - stress test - Holter monitoring You should schedule an immediate appointment with you local cardiologist. If you have any other episode, should run to ER for further evaluations. Meanwhile, I advise to: - avoid foods/drinks high in caffeine - avoid moderate to intense physical activity Hope it helped! Dr.Albana