I had something very similar to what you're describing I had something called AF "Ateral fibulation" Atrial fibrillation is usually accompanied by symptoms related to a rapid heart rate. Rapid and irregular heart rates may be perceived as palpitations, exercise intolerance, and occasionally produce angina (if the rate is faster and puts the heart under strain) and congestive symptoms of shortness of breath or edema.
The best thing I suggest is going to your doctor and getting him to do something called a ECG. Basically just looks at the rhythm of your heart and other things. It dos not hurt and it takes about 30 seconds. (All they do is place some pads on you.
I had to go on a form of beta-blockers and a few weeks later they Cardioverted me. It's basically a small electric shock to get your heart back into normal sinus rhythm. That may well seem very daunting but don't worry that you may not even have that after all not a doctor. I hope this helps and good luck. if you do want to talk more to me about this please contact me via my website below.
Jez
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