text:  Walgreens is finalizing a business plan that could result in the closure of hundreds of stores in the next three years. It's been losing money on prescriptions and losing business to Amazon. Chuck Sievertson, 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.