SEATTLE — Pain was the first clue. Sharp, jagged streaks of it shooting up the sides of Rahima Jackson’s body. Jackson’s pain grew worse at night. It hurt to lie down, so she learned to sleep standing up, her back leaned against a wall. At first, Jackson, a 50-year-old former home health aide with an easy laugh, avoided going to the doctor. No insurance. Then the day came when she couldn’t take it anymore. A searing pain in her right breast had become too overwhelming to ignore, and Jackson pulled on her backpack and asked friends to take her to the emergency room. Within days, Jackson was tra…