Suggest Treatment For Retracted Eardrum

Hi, I ve been diagnosed with a retracted eardrum. I haven t had much pain or deafness but just a crackling sound in the ear. I love to go Scuba Diving, and I m hoping to go in June is there anything I can do. I m using Beconase nasal spray but it hasn t helped. I last dived in November 2010 and haven t had any problems until a fortnight ago.