People report many symptoms when they experience AF, but some don't know they have it at all...so no symptoms. For my second-ever bout of AF, maybe two months after my first and being diagnosed with 'paroxysmal AF' , I could hardly catch my breath by the time I was standing in front of the triage nurse at the ER. All other times, I just felt the thumping in my left chest wall, but not much else...except for some anxiety, of course, which would be perfectly natural for someone who is symptomatic.
If you begin to experience AF over time, especially if it comes on more frequently, and if its lasts longer, it is probably an indication that you should see a cardiologist and then get referred to an electrophysiologist about a mechanical remedy known as 'catheter ablation'. I won't go on to describe what it is...we can save that for now...but it has a good chance at stemming the electrical impulses, the extra ones, that cause the extra beats. No more AF, so no more nasty symptoms.
One other consideration. It might be worth asking for a formal assessment of your system-wide magnesium levels. Magnesium is very important for muscle, but especially myocyte, function...they being heart muscle cells. We in the western world often run short of magnesium due to diet and due to over-production of produce from soils. If you are deficient, supplementation is easily done, and your physician can offer you guidance. Each drug store has several varieties of magnesium salts from which to choose, but I would not go running to the nearest drug store until you KNOW you are short of magnesium.