 A warning from Senator Bernie Sanders about Amazon's Prime Day. The independent Vermont senator claims Prime Day has been a major cause of injuries for warehouse workers packing all those orders. Daria Albinger, ABC News. I'm Kareem Abdul-Jabbar. I learned about atrial fibrillation the hard way. My symptoms would come and go. Shortness of breath, fatigue. I kept going. Then I got so lightheaded, I couldn't. My doctor said I have AFib, so I'm about five times more likely to have a stroke.