"I am feeling really good," she told her colleagues. "Physically, I feel remarkably well. Mentally, it's another challenge because that was phase one."
"There are days where if you really start to let your mind wander, it's really devastating," she added.
Nevertheless, the 40-year-old journalist said she tries to stay focused.
“You keep your head together, you come into work, you hug your friends, and you’re thankful to be where you are with your family and the people who matter.
Though Robach had a double mastectomy, doctors told her that the cancer had spread to a lymph node. That means she'll have to undergo chemotherapy.
"That was the devastating news to me," Robach said. "When I woke up, the first question I asked was, 'Did it spread to my lymph nodes?,' because that's the difference between chemo and no chemo."
But doctors have also said that her prognosis is "good."
"I want to be at my daughters' graduations. I want to be at their weddings. I want to hold my grandchildren," she told People.
Speaking to Robin Roberts, who has survived breast cancer and myelodysplastic syndrome, Robah said: "You give me strength, Robin, because it is important to get up and have something to do each day, even if you don't feel great."
[Us Weekly, People]