"GOOD MORNING AMERICA” co-anchor ROBIN ROBERTS has snubbed her doctors’ orders to slow down, and worried pals fear she has just two years to live!

The 52-year-old workaholic defied all odds by returning to the ABC show just five months after undergoing a painful bone marrow transplant in a last-chance bid to beat a cancer-related blood disorder.

“Robin’s doctors have laid out the harsh truth for her – she’ll be dead in two years if she doesn’t give up her job and start taking it easy,” said a source.

“But Robin is so competitive she can’t help herself. When her friends and family try to talk sense to her, she responds by saying that she made a commitment to her co-workers on ‘GMA.’

“Plus Robin was so depressed when she was stuck at home recovering. She says go­ing to work is her happy pill.”

The plucky TV star’s health woes began in 2007 when she was diagnosed with breast cancer. Robin underwent chemotherapy and radiation treatments, and in 2012 she was diagnosed with the debilitating blood condition myelodysplastic syndrome.

On Sept. 20, she received a bone marrow transplant – sister Sally-Ann was a match­ing cell donor. Gutsy Robin, a three-time Emmy winner as an ESPN sportscaster, returned to “GMA” on Feb. 20.

“Robin nearly killed herself to get back on the air in time for the crucial February sweeps, even though her bosses said it wasn’t necessary,” revealed the source.

“Then she pushed herself even further by flying out to Los Angeles for the Academy Awards.”

But another source close to the brave broadcaster insists Robin is easing back into the daily grind.

“During the first week in March, she worked only two days,” said the source. “Robin is following her doctors’ advice and monitoring her schedule closely.”

But stresses are mounting.

ABC has been slammed for ex­ploiting Robin’s life-or-death battle and, as The ENQUIRER has reported, the never-married personality is said to be heart­broken over losing the love of her life, a woman named Storm Sahara.

Meanwhile, medical experts warn that Robin could be living on borrowed time.

As a bone marrow recipient, she now takes an immune system-suppressing drug that’s “setting her up for developing more cancer,” such as leukemia, said Dr. Gabe Mirkin (who has not treated Robin), a retired physician from Orlando, Fla., and author of “The Healthy Heart Miracle.”

EVEN MORE OMINOUS, bone marrow transplants have only a 30 to 40 percent suc­cess rate, according to radiation oncologist Dr. Jerome Spunberg,

“Ms. Roberts is still in danger of developing potentially deadly graft-ver­sus-host disease, in which the body rejects the transplanted bone marrow cells,” he explained.

The source added: “Robin is playing Russian roulette. If she doesn’t slow down, friends fear she won’t have long to live.”