Hi thanks for asking question. Noted your child having fever with breathlessness. So here it could be viral bronchitis or pneumonia like condition if associated with chest pain also.. Chest x ray will be useful for it. CBC also done to look for lymphocytosis (in viral) and neutrophilia (bacterial). If needed antibiotic needed.... Your child physical examination also done with auscultation for creps or rhonchi if heard. If excess stress taken then by panic attack also such presentation can occur if no respiratory cause detected. Meanwhile motivate your child to loose weight. Because by high cholesterol and induced fatty liver also liver enzymes can be elevated. USG useful for it... Motivate him for yoga and daily exercise.It will beneficial in reducing weight as well as in relieving depression ... Hope your concern solved. Take care .