Hello.  I am female, 41 yrs. Old, w/ no previous history of heart problems.  I have had infrequently and randomly over the past couple of weeks a sensation that my heart was beating a little faster than usual, accompanied by a feeling of a flutter, or a bubble pushing upwards, which disappears instantly.  My heart also skips a beat at this time.  What is going on w/ my heart?  I have no dizziness, nor lightheadedness.
Dear Mrs, You describe elevated heart rate, which is usually benign and can be caused by many reasons, such as stress, over-tiredness etc. You also describe some kind of arrhythmia, which can be benign, if is not very frequent, and can have same causes. If you have a stressful period, I would advise you, try to regulate your lifestyle, have a healthy sleep, and everything will normalize gradually. If you see no improvement, I would advise you to see your doctor, to perform an ECG, and some labs, such as serum electrolytes, He, thyroid tests. Wishing you a good health