Hi KAZ2Y5
The person to look at your review form will be a new person.
You don't have to send in medical evidence you have sent before because they will have it. Having said that - lots of people do send the information again because they don't trust the DWP. You have to do what feels right for you.
Yes, I would try and get an up-to-date letter from your GP to confirm ongoing hearing issues and the fact it has deteriorated.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems