Something similar happened to a friend of mine about 2 years ago. They had previously completely removed her stomach and gallbladder, which among other problems kept causing severe anemia. When she started passing out they took her the hospital where they put a line in to give her blood. As they started the blood she kept complaining of chest pain, but just kept giving her pain killers. After numerous pints of blood and her counts were not going up they finally figured out that they had the line in her chest cavity, not a vein!!! Somehow she managed to survive that.