Hello respected Doctors, Asking this on behalf of my best friend. She is 35 yr old unmarried. Height 5ft 3inch. Weight 50 kgs quite slim. Off late she googles up symtoms related to small things. Then after reading it she feels tightness on her chest with lot of panic and feel breathlessness. She walks to her office with episodes of breathlessness and fear of dying and feels she will pass out. She has done her ecg, 2D eco,chest x-ray, CT scan TMT, thyroid and all blood tests which are normal. What is happening to her if all tests are negative? She has stopped going out now. And many of my friends are encountering the same. Kindly assist.