This would be great for everything listed except tinnitus. You hear random ringing in your ears that isn't caused by an external sound when you have that.

Yep, this. Thankfully I’ve had mine since I was a little kid so I can ignore it rather than being driven crazy by this constant high-pitched noise ringing in the background of everything. It randomly does get louder and more intense or...slightly less loud. When I notice it, I force myself to ignore it or else I’d probably want to jump out of my ******* body. Sometimes I lie awake at night and wonder what actual, true absolute silence is like. Must be nice.