hi. my hearing is also due to standing close to speakers at heavy metal shows. a had an mri done and a bone , very little one, behind the ear drum is broken. it can be fixed with surgery bur i have not done that yet. i also experienced what you described.
"What do we want?" "Time machines!!!" "When do we want them?" "That's irrelevant!"
There are many type of hearing loss. The one that you are going trough may be the conductive hearing loss. All that can be done now is follow up with the doctor and see what he suggest the reason is and how can it be corrected.