When 9-year-old Jeremy Brown is in pain, it feels like he is being stabbed, while the pain experienced by Deborah Oliver, 40, is like a hundred simultaneous charley horses. Brown, of Bridgeport, and Oliver, of New Haven, have sickle cell disease (SCD), a genetic blood disorder that causes excruciating pain, life-threatening complications and a shortened life expectancy. Almost one-half of sickle cell patients die in their 40s. The disease affects some 100,000 Americans, about one in 365 African Americans and one out of 16,300 Hispanics; and in lesser numbers, people with Middle Eastern, Indian, Caribbean and Mediterranean ancestries. An estimated 2,000 people in Connecticut have SCD.