When I experienced a fib it was a rapid, irregular beat. If you feel you have a problem that may be life threatening, see a doctor NOW. Good luck.
It does seem like arrhythmia. Again, for me my a fib was an rapad and irregular. I could not describe my situation as having a predictable heart beat.
Like the previous post, anxiety does play a role. The important thing, particularly since you don't have another heart in reserve, see a doctor as soon as possible.
also when my heart speeds up every other beat becomes a weird misbeat. did u have this?
Please don't worry. Worry causes anxiety and you deserve better than that. Worry means doing nothing and you have it within your control to do something. Go to the doctor, but before you do that, stop all worry. It accomplishes nothing.