I've also been struggling with noise bombardment.

I think it's a combination of sensory processing disorder, all my life, and illness-induced hyperacusis, over the last several years, and loud construction noises, car noises, sirens, backup beepers, etc. It is a nasty one-two-three punch.

I'm getting a bit better, now, with:

* air filters, since these help with my allergies, and these also help me get used to the noise and to mask or moderate all the other noise.

* ear plugs and ear protectors when going outside, going anyplace loud, etc. I use Radians custom-moldable ear plugs and 3M ear protectors. But I find them too uncomfortable to wear all the time.

* quitting salicylates, such as aspirin, other nsaids, tea, turmeric, cinnamon, etc. since these are ototoxic and can cause hyperacusis.

* quitting caffeine.

I'm not a doctor, but you might want to look into allergies, salicylate sensitivity if you are taking or eating salicylates, inner ear issues such as superior semicircular canal dehisence, and/or illnesses such as Lyme disease, multiple sclerosis, etc.