EXCLUSIVE: Tortured Rocker John Mellencamp ‘Desperate’ to Make Up With Once-Estranged Daughter Teddi As She Battles Brain Cancer — ‘It’s Make or Break For Him……See More

Rocker John Mellencamp is desperate to make up for lost time with his once estranged daughter, Teddi Mellencamp Arroyave now that she’s been diagnosed with deadly brain cancer, RadarOnline.com can reveal.

Real Housewives of Beverly Hills star Teddi, 43, who previously fought a long battle with melanoma skin cancer, was suffering debilitating headaches for weeks before a checkup revealed the dire news.

After a CT scan and MRI, doctors found multiple tumors on my brain, which they believe have been growing for at least 6 months,” she wrote in a February 12 Instagram post.

Her revelation was apparently a real gut-punch to her 73-year-old dad, sources tell us.

“John has been rocked even harder than Teddi by this diagnosis,” our insider said. “They butted heads a lot and didn’t speak for four years at one point. “He’s kicking himself for all the time they missed out on!”

Teddi immediately underwent emergency surgery to remove two large tumors from her brain and now faces radiation treatments to eradicate smaller growths – though recently gave a bleak update to fans saying doctors had discovered five more tumours in her body.