It was a few days after Roberts, 52, underwent the transplant for a rare blood and bone marrow disorder called myelodysplastic syndrome. "I couldn't eat or drink," she says. "I couldn’t even get out of bed."
Fading in and out of consciousness, Roberts recalls, "I was in a coma-like state. I truly felt I was slipping away … then I kept hearing my name."
Five months later, Roberts, a breast cancer survivor, says she's finally beginning to feel like her old self again: "It's an amazing feeling, each day feeling stronger."
She will return to GMA on Feb. 20 and will be featured on a special edition of 20/20, airing Feb. 22.
For more on Roberts's brave fight for her life, her toughest moments and her amazing recovery, check out this week's issue of PEOPLE, on newsstands Friday