Kathryn Owen, 42, of Co Down, is one of thousands of health workers who have volunteered to return to reinforce figures on the frontline against coronavirus.
More than 14,000 people have signed up for health and social work in Northern Ireland ahead of the expected large increase in Covid-19 patients in the coming days.
The total number of people killed in the Coronavirus region reached 56 on Friday.
Owen said she volunteered before the main road because she saw the need approaching.
She was a dental nurse before becoming a doctor in the RAF.
After leaving the RAF, she became a licensed practical nurse before resuming full-time studies and is currently pursuing a doctorate in cardiology at the University of Ulster and, last year, became an adviser to the Democratic Unionist Party.
She said it will be put on hold during Covid-19 efforts.
Her party leader and prime minister, Arlene Foster, was among those who congratulated her for coming.
“The decision itself was really not a difficult decision, it was a case where it was going to happen, where are the forms? “She told the PA news agency.
“This side of things was like putting on a seat belt, but it was difficult for my family, the hardest part was seeing how worried they were.”
“I hope other people do it too, and that’s why I’m talking about it, I want other people to do the same too. “
Owen said she was due to start next week at one of Northern Ireland’s Covid-19 centers and that the news of a huge shipment of personal protective equipment to Northern Ireland was welcome.
She admitted that she was afraid, but said that she could never forgive herself if she did not come forward to help him.
“The NHS is a big family, there is no way on this planet that I was going to let my colleagues assume this, I would never be able to forgive myself,” she said.
“I am thrilled with the PPE because I know it was a real concern, especially for some of my friends from the Belfast Trust, it has allayed the anxiety a bit, and having these tests will be really important.
“I’m scared, I’m not going to pretend I’m some kind of invincible super-woman, I’m scared but you only have to put that in mind and what will be. “
Owen added that what she feels now is similar to her military days before a deployment.
“You feel exactly the same, sitting at the airport, waiting for planes to take you abroad, preparing for combat, coolers in training, adrenaline and not knowing what I’m walking in. “