When Justine Carter stepped on the treadmill for a quick energy boost last May, she never thought it would lead to a near-death experience. The Utah mother, 33, was fit and healthy — but 12 minutes into her walk, she started having shortness of breath and a pain in her back that penetrated to her chest.When that was followed by violent vomiting, Carter assumed she’d been hit with a terrible stomach flu.SOY MILK COULD REDUCE RISK FACTORS FOR HEART DISEASE, RESEARCH SHOWS"That's where things get a little bit hazy," she told Fox News Digital during an interview.Carter called her husband and