Do not give up hope!
I struggled for a lifetime, never being diagnosed and basically treated as an idiot or overly sensitive.
Due to current medical issues, I finally found diagnosises and help. And recognition: professionals saying "You must be a zen ninja warrior, able to function with hyperacousis & visual overdependency living in a city" .
Since only a few months, I have been receiving treatment for hyperacousis and it feels like a miracle!
Dr Boedts has developed a system where he places patches on the typhan to relax it. The day after my first patches, I passed a building side with heavy metal sounds.. And I could easily cope. My sleep got instantly better.
The patches dissolve after a few weeks and need to be replaced, until the nervous system comes out of hyperalert and rewires.
He combines it with trascutane electrostimulation of the brain (12 sessions in 5 weeks) and temporary medication (I decline that option, as can handle through meditation & yoga). If necessary, as in my case (severe TMJ problems due to an accident), the clinics orofacial therapist a.o. puts electrostimulation on the trigeminus nerve to relax it. She also showed me more efficient selfmassage techniques to release the masseter muscle.

Additionally, I got diagnosed with visual overdependency, which I feel is linked so doing treatment for this at the same time.
And working with a Feldenkrais & BMC practicioner.

Honestly, it is a miracle.
So I wish for you to find similar treatment near you ( I am based in Europe, Belgium). Or come over for a few months!