A few years ago, a very nice woman named Lucy came to see me about some symptoms she was having. From the beginning she was convinced she had a parasite, and her story is in many ways, representative of the trials and tribulations of figuring out whether that may indeed be the case. Lucy had seen a number of gastroenterologists before me, and reading between the lines of their notes in her medical records, I could see they thought she was a little bit intense. She was a little bit intense, and rightly so. I would have been, too, if my life had been turned upside down by symptoms that no one could explain and that weren’t getting any better. In addition to bloating, she was also having fatigue, upper abdominal pain, nausea, and what she described as “weird” stools. The first gastroenterologist Lucy saw did an upper endoscopy, thinking…