Here is a link that can probably prove helpful (I haven't checked its content myself, but picked it up on the Vinyl Asylum which is a very rich source of information and links).
[
www.tinnitus.org.uk]
I have a mild case myself. Luckily for me I can (still) live with it comfortably.
...The most both hilarious and sad anecdote about Townshend's hearing issue is the tale of the drum kit explosion on the Smothers Brothers show, as told in The Kids Are Alright DVD booklet. Moon would have brided the TV stage hand to DOUBLE the bass drum explosive charge for the apotheosis ending of My Generation. When the blast happens on the film, you can see that PT stands in front of the kit. Then you see that his hair are all straight up on their ends, then he ruffles them and smiles silently to John Smothers who comes over applauding: PT had turned apparently COMPLETELY deaf for several minutes...