When Nevin Shoker, 29, began coughing so violently that he started throwing up, he thought something was seriously wrong. But his doctor insisted that it was nothing to worry about. The attacks escalated quickly—and within weeks, Shoker, who lives in California, found himself also suffering from severe itching and unexplained fatigue. “My legs were itching to the point where it felt like there was like bugs under my skin. I was just like scratching till I bled,” he told Newsweek . Yet his