Missy Elliot's Health Crisis, and 'Behind the Music' Sneak Peek!

Rapper Missy Elliot has been battling Graves' disease for the past three years. The illness, an autoimmune disorder that leads to over-activity of the thyroid gland, was so debilitating that Elliot took control to make positive changes in her lifestyle -- including losing 30 pounds.

"I feel great," Elliot says on VH1's "Behind the Music," premiering Wednesday, June 29. "Under my doctor's supervision, I've been off medication for about a year and I'm completely managing the condition through diet and exercise."

Check out a sneak peek of Missy's dramatic VH1 interview!