I'm sorry to hear about the tinnitus, I know how difficult it can be to deal with hearing/sound issues too. Whilst I can't imagine never being able to experience silence, I have misophonia and I think that's the main reason I developed depression too - it's the constant feeling of being on edge, always anxious, that makes it so hard.
I reckon you're more at risk of developing depression if you have tinnitus as well - a lack of effective coping mechanisms would no doubt cause hopelessness and emotional distress
Have you had any luck speaking to a dr about the tinnitus?
I'd recommend trying to listen to white noise to help distract yourself when it gets bad, if you haven't already. I normally use brown noise and I know it doesn't fix the issue, but it makes it a bit more bearable :/