When Donald Trump assumes the Oval Office in January, he vows to overhaul healthcare. Specifically, he plans to repeal the Affordable Care Act, better known as ObamaCare.

More than 20 million Americans are covered through ObamaCare and open enrollment is currently underway. Those who have public health insurance are terrified that they could lose life-saving coverage.

"On my 38th birthday, I got diagnosed with cancer," said truck driver Cathie Miller who was diagnosed with a malignant tumor while living in L.A. Only 80 people in the world have had it, which makes treatment expensive.

"I literally had a social worker come into my hospital room and tell me, 'You are done. Your insurance is cutting you off. You have reached your lifetime maximum,'" she recalled.

She had to look out of state for help and found Texas.

"I was going to UCLA oncology but UT-San Antonio took me, and they took care of me until Obamacare kicked in and I got insurance," Miller said.

She says that Obamacare saved her life because it didn't have that lifetime maximum.

"We had 100,000 people across the country enroll yesterday," said Frank Morales, a certified application counselor with Centro Med that is signing dozens of Texans up for Obamacare every day. "The difference between being able to get into a good insurance policy and having preventive services and not having that looming medical bankruptcy out there, it just changes people's lives tremendously," Morales said.

But now that Trump is moving into the White House, the future of publicly-funded healthcare in America is up in the air, leaving Miller in limbo.

"I don't know what Trump is going to do," she said. "I don't know if I will have benefits in six months."

Trump does plan to keep some provisions, like insuring those with pre-existing conditions. Miller hopes lifetime maximum caps stay away, too.