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Hayden Panettiere is opening up about the toll grief took on her body after her younger brother Jansen died unexpectedly in 2023. In the days after learning her only sibling, also an actor, had died at age 28 of an undiagnosed enlarged heart, she tells PEOPLE that her entire body began swelling up, and she was powerless to stop it. “I just ballooned out,” Panettiere, 35, says of her rapid 40-pound. weight gain. “It didn’t matter what I did, what I ate. I know stress and cortisol running through your…