Williams had taken time off earlier this year after revealing she was battling Graves Disease, an immune disorder affecting the thyroid.
"I pressed the reset button over my entire career while I was off for three weeks," she said. "Reset on everything, reset on like how I'm dealing with my health."
Speaking with Amy Robach on "Good Morning America," Williams said, "We as women...we take care of everyone but ourselves" and vowed to put herself first from now on.
Last October, Williams passed out during a live taping of her show. She now attributes that to her battle with Graves.
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