Discuss the treatment strategies for children with middle ear infection accompanied by purulent earwax, including medication, regional treatment, and surgical options, and emphasize the importance of dietary adjustment.
A 7-year-old boy, in elementary school, has recently been experiencing itchy and painful ears, with occasional yellow fluid discharge. At the same time, he has a lack of appetite and discomfort in his throat. What are the treatment methods for children with middle ear infection and yellow discharge?