Occasionally I'll get heart palpitations but I just cough and poof they're gone!
In a way, you are fortunate. As I mentioned earlier, I have Permanent Atrial Fibrillation and am assymptomatic -- meaning I have no symptoms. This relieves me not only of any discomfort but allows me to enjoy a "normal" lifestyle; no shortness of breath, no chest pains, no fatique, etc. The downside is that my body does not inform me of any irregularities.
My normal, at rest, heart rate is in the 60s but can race to the 150s. Furthermore, the rate is very irregular, e.g., rapid beats followed by 2-3 seconds with no beats (but averaging 65 bpm). It is this rapid beat and the pause that puts me at risk for a stroke. The rapid beat causes the heart (the pump) to be inefficient and the pause causes the blood flow to stop or, at least, slow down considerably. Each of these situations cause the blood to pool in the heart and, consequently, could coagulate. A clot could then be forced from the heart directly to the brain. Again, I have no sensation of this irregular heart action.
I take a small dose of Atenolol (beta-blocker) in the morning and a small dose of Digoxin in the evening to prevent my heart rate from "taking off." In addition, I am on (and will be for the rest of my life) Warfarin that regulates the Prothrombine Time of my blood to around 2.1 INR (I believe this is an International measurement of how long it takes blood to clot after it is exposed to air.) ("Beta," by the way, is another term for adrenolin.)
Since I am asymtomatic, I have no restrictions on my physical activities. I can, for example, walk, at 4 mph, for 45 minutes with no discomfort. I do find it hard sometimes to walk up steep slopes at high altitude (10,000 or so) but blame this more on age than on my heart condition. I do try to avoid Rock Climbing and other physical contact activities because of the Warfarin and the risk of bleeding.
I am, in all other respects, pretty healthy -- blood pressure 110/60, total Cholestoral in the 155 range with good HDL/LDL ratio, low blood sugar, etc. I should point out I am a little on the heavy side (5' 11' - 215-220 lbs) and not quite as limber as I once was. My Primary Care physician calls my A. Fib an "anomoly" but I could do without it if given the choice.
There are over 2 million people in the United State with A. Fib. so this is a fairly common condition. I have, over the past six years, come to the conclusion that there are about the same number of ways the condition presents itself. There are, as far as I can tell, no reliable generalities that are useful for self-diagnosis and self-treatment. Everyone (and I do mean everyone) is different. On the other hand, there are many people who have lived with it for over fifty years without any serious complications.
Okay, that was a little "windy" for me. I have taken the time to write all this because my condition was found by "accident." During a routine Annual Physical, I asked the doctor to check the accuracy of my personal Blood Pressure machine against his. When he put the stethoscope to the inside of my elbow, he got a funny look on his face and said, "Oh, oh!" The nurse had taken a reading of 72 bpm just minutes earlier and noticed nothing wrong. I could have easily been one of those who "was healthy as an ox and just keeled over one day" had it not been for that quirk in the examination. I guess my point is that if something doesn't "feel" right with your heart, don't ignore it, see a doctor immediately. If you are like me and have no sensation of your heart beating (I can't even take my own pulse), ask that the doctor check your heart rate instead of (or in addition to) having the nurse do it. Apparently, the sound of a heart in A. Fib. is pretty distinctive.