ABCNews -- For 22-year-old Jacob Rosenberg, life without his daily dose of Vicodin wouldn't be much of a life at all. "Before I began taking narcotics two years ago, I would spend my days in bed," said Rosenberg, who has suffered from fibromyalgia and rheumatoid arthritis for five years, and chronic pain for 10. "I was in college and I wasn't capable of doing anything go to classes or go out." "But since I've been on Vicodin my pain is 80 percent diminished," said Rosenberg. "It gives me the ability to be a normal person." Rosenberg is one of millions of Americans who fill prescriptions each year for an acetaminophen-based narcotic or combination drugs such as Vicodin or Percocet, the two most popularly prescribed drugs in the country. But patients...