A couple of weeks ago, my assitant in my classroom had upper back aches and when lying down, sharp pain in her sternum. Her doctor diagnosed pluersy. After that a student, with limited communication, complained of "hurting all over" while pointing to her chest and upper abdomen. I now have come down with the same symptoms and when I wake up in the mornings I have a sharp pain right underneath my breastbone which feels like a broken rib. My upper back seems to be aching worse after a day of the symptoms. My assistant also says her husband complained of the same symptoms. Can you help us figure out what this might be?