But you're lucky, relatively speaking. If you were shot in the heart, your blood pressure would quickly drop, but it would take 10 to 15 seconds to lose brain function. In that time you could draw your gun, utter last words, or spend some time thinking about your unfortunate situation.
Caffeine can cause indigestion, which in turn may lead to heart palpitations. However, arrhythmia (abnormal heart rhythm) can also cause palpitations, and this condition is more of a concern. Seek medical attention if your palpitations last longer than two or three minutes.
Irregular heartbeats can be normally present or as a result of cardiac disorder.In a normal person also sometimes there may arise an irregular beat unknowingly. Get a routine echo cardiogram done, to confirm that you often have irregular heartbeats. If irregular heartbeats are fast than normal that too occasionally then it could be a cause of worry. Usually an irregular beats are result of an arrhythmic impulse generated in muscles from which is apart from normally occurring impulses.