One week after turning 52, Tom Scocca fell while trying to catch a train at a New York City subway station, his legs having simply given out, he explains in an essay at New York. Soon he was experiencing a number of mysterious symptoms: tingling and numbness in his extremities, swollen hands and feet, finger stiffness, chest tightness, shortness of breath. He went to his doctor and got no answers; he went to a bevy of specialists and the lack of answers continued. Test after test came back normal (with the exception of his blood testing positive for general inflammation), but his symptoms cont…