When Donna Hernandez had the flu last year, she went to her local emergency room in New Mexico, where she received two IV bags of saline, a dose of antiviral medication and a drug to help with her nausea. She says after about two and a half hours, she was on her way. Hernandez recovered from the flu, but still hasn't recovered from the shock of the bill she received afterward. It was for more than $6,000.