I was feeling really anxious at work on Monday. I had had a big lunch that made me feel full and so I went for a walk to relieve some pressure. Came back to work and was still anxious. I climb the stairs to my office, about 15 steps, and suddenly my heart started beating really fast, which triggered a panic attack. It was an embarrassing ordeal. Lasted like 10 minutes with coworkers around me. I just could not calm my heart rate down no matter how many deep breaths I took. Again, it only lasted 10 minutes, and I didn't notice any fluttering or abnormal rhythm. Just a fast heart rate. I know I was having a panic attack, but could it also have been afib? Does the heart have to flutter or be out of rhythm to be in afib, or does a fast rate count too?