Less than 24 hours after a case of pancreatitis sent theBlink-182drummer to Cedars-Sinai Medical Center in Los Angeleson a stretcher, a source tells PEOPLE, “Kourtney won’t leave his side.”

“Kourtney was worried yesterday. They both were,” the source told PEOPLE. “Travis was suffering from extreme stomach pain and could barely walk.”

Travis Barker and Kourtney Kardashian.Cindy Ord/MG22/Getty

NEW YORK, NEW YORK - MAY 02: (Exclusive Coverage) (L-R) Travis Barker and Kourtney Kardashian attend The 2022 Met Gala Celebrating “In America: An Anthology of Fashion” at The Metropolitan Museum of Art on May 02, 2022 in New York City. (Photo by Cindy Ord/MG22/Getty Images for The Met Museum/Vogue )

The source added, “He is getting the best care at Cedars though,” noting that doctors are focusing on pain management and determining Barker’s condition via a battery of tests and a modified diet.

Travis Barker.Steve Jennings/WireImage

SAN FRANCISCO, CA - AUGUST 09: Drummer Travis Barker of Blink 182 performs on Day 1 during the 2019 Outside Lands Music & Arts Festival at Golden Gate Park on August 9, 2019 in San Francisco, California. (Photo by Steve Jennings/WireImage)

After Barker entered the hospital, his 16-year-old daughterAlabamasent aplea to her followers on social media, writing on her Instagram Story for them to “send your prayers” for her dad.

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Across the country, 18-year-old sonLandonperformed his “Die in California” collaboration with rapperMachine Gun Kelly, 32, at his Mainstream Sellout Tour concert at Madison Square Garden in New York City.

Alabama Barker, Travis Barker, and Landon Barker.Phillip Faraone/Getty

Travis Barker

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“Landon came out during the song and seemed to be working out some demons,” he said. “They hugged onstage during the performance, singing and shared an emotional moment at the end of the song before Landon walked off.”

source: people.com