My daughter is 15 years old and she is overweight. She says she is having difficulty in breathing from past few days .yesterday she was excercising after a long time and she got I needle like pain in her chest .even she has burning sensation in chest sometimes and dry throat for many days. When she is eating and sleeping or concentrating on something she doesn't feel breathlessness.she is a really anxious person . Is it serious ? Does she need to do chest x ray and ecg ?? Please tell as soon as possible.