Welcome to The Thin Line, The New York Post’s series about the darker side of GLP-1 drugs. Though GLP-1 agonists sold under brand names like Ozempic have helped millions of people lose weight, manage diabetes and improve other health conditions, they are not without risks. Check back for more stories about the lesser-known downsides of these wildly popular medications. Brooke Hinderhan thought she had turned a corner with her health. After metformin failed to control her diabetes, doctors prescribed Ozempic. For a time, the popular GLP-1 drug worked, bringing her blood sugar under control. Even the side effects were manageable — until she developed severe fatigue, followed by diarrhea and stomach cramps that left her doubled over in pain. “I thought it was just the Ozempic,” said Hinderhan, 47, a registered nurse case manager from Norris, Illinois. Brooke Hinderhan initially believed her cancer symptoms were caused by the GLP-1 she was taking for diabetes.…