Hearing loss

Hi

I am new to the forum. 

I recently completed radiotherapy at the end of August for cancer after the removal of tonsils and remaining cancer in a lymph node in my neck. 

I have since suffered what feels like blocked ears. It is far less apparent when I am laying down, I feel mobile fluid. A visit to the audiologist revealed no build up of ear wax but fluid behind the ear drum. 

any advice of what treatment I should have. I am due to see my oncologist tomorrow. 

many thanks