Have you ever tried self hypnosis??
I work nights and the daytime noises either physically increased or I just started noticing them a few months ago, I also suffer from tinnitus which got worse, leaving me thinking it was stress caused by my financial situation that's still not resolved. So I turned to self hypnosis and cured myself. I can now sleep for hours on end through the daytime and I can hardly hear my tinnitus.
I put myself in a mild trance and keep telling my sub conscious "That noise is background noise, there's nothing I can do about it, it's totally out of my control so I might as well ignore it and get on with the task at hand."
Think about when you were last at home or in a pub and you're involved in a deeply engrossing conversation with someone, don't notice what's being said on the TV or if you're in a pub you ignore the noise around you. It just becomes background noise that you ignore.
And to get into that trance here's a very simple exercise you can all do.
I'll assume there's some background noise in the room you're in right now, I've got the fans in my PC whirring away right now. Find a similar sound and listen to it for a while..
Now sit back, close your eyes and relax for a while, spend a minute or two thinking about a time when you were having an engrossing conversation with someone and there was a lot of noise around you but you ignored the noise and carried on...
Think about the last great film you watched or some other meaningful experience, rerun your memories of all that. When you come to the end of the memory you should notice you weren't paying any attention to the noise you were listening to at the start.
It isn't difficult once you realise just how easy it is because our brains are doing it all the time for us. The trick is to control when it does it for us.
It won't work for everyone because there may be other underlying reasons like a traumatic event from your past and your sub conscious is increasing the background events but it should work for a lot of people.