Hi, my nephew is 10 yrs old and he very smart and does excellent in school and sports and karate. He is very social in his comfortable environment, ie, school, at home, karate class, science club...In a new environment he is sometimes quiet and shy until he gets comfortable and opens up. The past 2 weeks he has been very somber and has been complaining that his "stomache hurts" He hasn't been eating much at all and has not been sleeping very well. His mom took him to the Dr.