Hi and thanks for the query It is possible that your ear infection is complicated leading to infection of the bone behind the ear called the mastoid bone. You will require an appropriate antibiotic. The right antibiotic can be selected by doing a culture and sensitivity testing. Please meet your ENT again for the same. Do not ignore the pain behind the ear, it could be a sign of impending complication. You can take any over the counter pain killer after checking the dosage. Regards, Dr Rajkishori.