—Juana Mari Moya—Getty ImagesNobody wants to talk about diarrhea—until they can't think about anything else. This summer's multistate Cyclospora outbreak has a lot of people suddenly paying closer attention to their guts. Unlike the typical 24-hour stomach bug, the parasite can keep people sick for weeks—but once it's identified and treated with the right antibiotic, most people start feeling better within days.Regardless of whether your misery …