Suggest Treatment For Headaches Caused After Tooth Extraction

Hi my son had his four wisdom teeth taken out on Friday, and on Sunday he started with a headache that is about an 8 on a scale of 1 to 10. It has continued through today and he still has it. Do not know what to do for him. Contacted the doctor that did the extraction and states that he wants him to continue on the medication, which his office first stated was causing the problem. Not sure what to do? Any suggestions?