Thisis probably not a heart attack, it is more likely to be Supra Ventricular Tachychardia and is caused by an electrical imbalance in the heart, although don't rely on this as a diagnosis. I suggest you see your physician as early as possible and explain your symptoms to them and get checked out. If it happens again you should seek immediate medical advice as it sometimes requires expert treatment to bring the heart rate back down to normal. If the rapid heart rate does not return natrually to normal sinus rhythm like yours did your heart can mucsle can become tired, it is therfore important that you seek medical treatment ASAP if it happens again. A heart attack is when the heart muscle is starved of oxygen due to a blocked coronary artery. This results in part of the heart muscle dying and potentially cardiac arrest. The symptoms of heart attack are sweating profusely, severe pain in the chest radiating down the arm and maybe into the jaw. The symptoms you descibe and your age and general health mean it is very unlikely you have had a heart attack.