What Causes Temporary Hearing Loss, Fluid And Pressure In Ear?

hello sir.i had a cold and went diving.then took a plan to my home.after two days my ear started to have distortion on louder sound and having hearing loss.i went to ent and he suctioned the fluid ou of my ear and gave antibiotics and i think some kinds of antihistamines.now after one month nothing j has changed and he says my middle ear bone,ossicles are fixated.i have to use sodium fluoride and if it does not work.he has to put a tube in my eardrum for air pressure balance.i am so unhappy.also it seems that sodium fluoride is not useful really and i don t know whether to use it or not.my ossicles are damaged because of diving not aging.also,if my bones are damadge,how putting a tube is gonna help them.are they gonna be more flexible using a tube?