Barlow continues, "Not to go into too many details I want everyone to know he still needs prayers as he is still in critical condition".
Barlow did not specify which organs were causing the trouble, or if he's received any definitive diagnosis, but Pro Wrestling Sheet previously reported the illness was heart-related.
Flair, 68, was placed in a medical coma over the weekend after he was admitted to the hospital.
Now his bride-to-be has revealed the "nightmare" the wrestler's family have endured. She said she was going on Facebook because she has been unable to call family or friends without breaking down.
Barlow's update is the first significant news on Flair's condition since Monday, when a WWE rep confirmed Flair was resting following an undisclosed surgical procedure. Thanks for all of the support and Love.
We'll keep you updated if further information is made available.
Fans and colleagues of the 16-time pro wrestling champion have continued to flood social media with well-wishes over the past few days. Flair entered the Hall of Fame again in 2012 as part of the Four Horsemen.
Hulk Hogan took to Twitter Wednesday to send his best.
"My thoughts and prayers are with Ric Flair", Levesque said.
ESPN will air, Nature Boy, the long-awaited documentary about Flair as part of the network's 30 for 30 series on November 7.