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First Look: Watch Jennifer Garner Desperately Fight for Answers About Her Daughter's Health in Miracles from Heaven

02/24/2016 AT 02:00 PM EST

Jennifer Garner shows that a mother's intuition can sometimes be a heartrending thing.

In this exclusive first clip from Miracles from Heaven – based on Christy Beam's 2015 memoir about her daughter's near-death experience and her long battle with a chronic digestive disease – Garner, 43, and onscreen husband Martin Henderson can be seen desperately approaching a smug doctor who does not appear to take concerns about their daughter's health seriously.

"This is not acid reflux. She's not lactose intolerant. There's something wrong with our little girl!" Garner (as Beam) exclaims, after previously explaining that the little girl has been throwing up for weeks.

When the doctor patronizingly tells her to "calm down," Garner's character isn't having it.

"No, you calm down," she shouts. "You find me another doctor. You run some more tests. I'm not leavin' this hospital until I know what's wrong with my daughter!"

Miracles from Heaven opens in theaters March 16.
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