The Grammy winner performed on New Year’s Eve following the news of her recent separation from husband, Offset

Cardi B is opening up about her behind-the-scenes battles!

Ahead of the 31-year-old Grammy winner’s performance at Dick Clark’s Rockin’ New Year’s Eve on Sunday night, the star revealed on her Instagram story that was “fighting” for her life.

“I’m literally fighting for my life right now,” the star told her 169 million Instagram followers. “I am so sick. I don’t understand because when I was in New York, I was going out with sweaters, toes out, everything.”

Cardi also joked that she’s “allergic to Florida,” adding that as soon as she landed in Miami for the show she felt “a little cough.”

“My chest started getting tight,” she said in the Instagram clip. “Bro, I’ve been fighting for three days and I have a huge performance later. Huge performance. Like, alright, I get that it’s New Year’s but I have this huge performance and I’m fighting, fighting.”

The “I Like It” rapper later shared a video of her sultry performance look as her stylist completed the finishing touches to her hair. Wearing large diamond earrings and a matching necklace, the musician sported a black cut-out gown for the show held at Fontainebleau Miami Beach.

Cardi B’s appearance on the famous holiday special — hosted by Ryan Seacrest — was announced alongside LL Cool J who performed with DJ Z-Trip in New York.

Along with LL Cool J and Cardi B, the live program included performances from Post Malone in Las Vegas, NewJeans in South Korea and Ivy Queen in Puerto Rico, as well as Aqua, Doechii, Ellie Goulding, Green Day, Janelle Monáe, Loud Luxury x Two Friends with Bebe Rexha, Ludacris, Nile Rodgers & CHIC, Paul Russell, Reneé Rapp with Coco Jones and Thirty Seconds to Mars.

The show follows the recent news that Cardi and her husband, Offset, have split after five years of marriage.

The singer revealed at the beginning of December that she and Offset, 32, had gone their separate ways.

“I’ve been single for a minute now,” she said, according to a recording of the livestream shared on X (formerly known as Twitter).

The “Bodak Yellow” rapper shared that some fans may have predicted a breakup was coming. “I don’t know if you guys have been getting clues from me, from my Lives, or from my Stories, when I put some certain music, or find my unfollowings.”

A week prior to her statement, she and the “Need It” rapper had unfollowed each other on Instagram.

After news of their split surfaced, a source told PEOPLE, “They’re tumultuous. They’ve broken up and gotten back together and broken up again way more than the public has seen.”

However, the insider added, “They’ve had really good times together.”

Cardi and Offset quietly tied the knot in 2017, and share two children together — daughter Kulture Kiari, 5, and son Wave Set, 2.