My name is Felita Sample. My mysterious illnesses and my daughter LaKrista’s strange afflictions developed after we moved from San Francisco’s Tenderloin neighborhood to Treasure Island. Imagine never-ending nausea and daily dizziness. You can’t tolerate the thought of food. You override this loathing and force yourself to eat. You soon find that anything edible, including water, triggers dry heaves that wrack your chest and abdomen.