A trip of a lifetime quickly turned into an unimaginable nightmare for a Massachusetts father who is fighting for his life halfway across the world after being bitten by a bug.

Scott and Claire Winslow always dreamt of sailing across the South Pacific with their family — and in April, they were finally able to turn their dream into a reality when they embarked on an “adventure of a lifetime” to enjoy their retirement, according to an online fundraiser. 

But just weeks into the three-month sailing voyage, Scott noticed what appeared to be a bug bite and his health rapidly deteriorated, WBZ-TV reported. 

His condition worsened for nearly two weeks while at sea alongside his nephew, and by the time their ship made it to land in Fiji, he was so weak that he was unable to walk.

The father-of-three was rushed to a local hospital, where doctors discovered the severity of his infection. 

“By the time they got to a doctor, he was so sick,” Scott’s daughter Lisa Babbin told the outlet. 

Scott was then transferred from a private hospital to the Intensive Care Unit at Lautoka Hospital on Vitu Levu, the main island of Fiji, where his wife Claire was heartbreakingly told to “prepare for the worst.”

The retiree remains critically ill on a ventilator, battling septic shock and organ failure.

The infection has spread to Scott’s lungs and gallbladder and his kidneys are functioning at “a fraction of their normal capacity,” the GoFundMe page says.

It’s still unclear how the infection started — whether by the insect bite, an infected wound or something else, according to the dad’s family.

While doctors are doing everything they can, Scott’s critical condition requires greater care than the local hospital can manage, according to his daughter.

“Every hour counts for my father,” Babbin said.

The family has secured a bed for the critically ill father at the Newton-Wellesley Hospital in Mass., but doesn’t know if they will be able to afford to fly him back to the United States for better care.

“All we need is a medflight, that’s the only thing we need to get him home,” Babbin said. “Medflights are not cheap.”

A special medical flight from Fiji to Boston — which is over 8,000 miles in distance — could set the family back a staggering $250,000, according to the outlet.

In addition to the fundraiser, the Winslow family has applied for a US government loan to help with the astronomical costs of flying Scott home as well as the foreign medical bills that are adding up without medical insurance coverage. 

Scott is a “hardworking, loyal, generous” man, “always willing to lend a hand,” relatives wrote on the fundraising page.

“He has spent a lifetime helping others, supporting his family, and being there whenever someone needed him.”

While Scott’s family “remain hopeful and continue to pray” for his recovery, “they are also facing the overwhelming financial burden that comes with a catastrophic medical emergency overseas,” the fundraiser says.