Article continues below advertisementTeddi Mellencamp shared a "heartbreaking" update in her fight against stage 4 cancer, revealing she's had to pause her immunotherapy treatment."Essentially, I haven't been feeling good for about a month, which was kind of shocking to me, and I think, mentally did a lot to me," Mellencamp, 44, revealed during the Wednesday, July 23, episode of her "Two T's in a Pod" podcast.Article continues below advertisementTeddi Mellencamp Shared a 'Heartbreaking' Cancer UpdateSource: MEGATeddi Mellencamp revealed she recently paused her immunotherapy treatments.