LOL
Well JFC I have not heard this saying for ages (“cock a deaf’n”) in fact in South Africa many Years back it was used all the time we said "cock a deffie" and meant just ignore!
As for Tinnitus well don't talk mate as I have had it in my Left Ear for some 35 Years now,at first nearly drove me mad,and I am sure was some cause of my Drinking (My excuse in those days LOL) but have managed to get used the 24/7 ringing now and it sort of sits in the background, that is during the day ,but at nights that's when it again raises its nasty head! I seem to fall asleep ok but during the night I am sure it wakes me up at various times!
I had spent a lot of Money on various things but to no avail,and have learnt that there is NO CURE!
Unfortunately an affliction besides my Deafness and bad Eyesight these days!
Isnt it wonderful to get old !! Grrrr!