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IT'S 2 A.M., AND YOU wake up with a terrible pain in your lower back. It's 5 p.m. on a Sunday afternoon and you suddenly feel extremely nauseous. It's 9 a.m. on a Wednesday morning and that cough that's been bothering you for a couple days suddenly seems to take a turn for the worse. What should you do in any and all of these situations? Should you visit the emergency room? C ...