I recommend this course from HealthUnlocked.
healthunlocked.com/programs...
One of the first steps to coping with Tinnitus, Hyperacusis etc. is understanding the basics. I've found having a level of understanding supports me when trying strategies. It's also helpful to revisit at time to time or get an understanding from a different perspective. Although I should add be wary of the charlatans out to make a profit from our misfortune.
This came up on my Healthunlocked feed, so I know it's going to be genuine and reliable information. Whilst it's specific to hearing loss, which may be the main cause of our condition, but I've gone through the first few sections about how 'our hearing works' and I think it beneficial to anyone regardless of cause.
Hope it helps!