Hi Blueallblue
You can score two points for needing hearing aids (Question 7). They won't just change your award. You will need to submit a change-of-circumstances request, which will trigger a review. You need to have suffered from hearing loss for at least three months before you inform them (which I assume you have). I'm sorry the waiting list in your area is so long. If the 2 possible points will push you into an enhanced award, you will probably want to inform them; if they won't, then you might want to wait until your next review.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems