You just described, nearly exactly, my experience of life from 2010 - 2016.
I am truly sorry this is so horrible for you.
Yes, researchers study tinnitus of all volumes. This is how we have learned fascinating things like "tinnitus distress is associated with gray matter deficits in the right anterior insula, and this is connected to other regions which relate to volume, but the two things seem to be modulated separately by attentional processes" and "people with a physiologically larger amygdala tend to experience more severe distress states, and the size of the amygdala actually changes fairly rapidly based on brain state and can be "shrunk" fairly effectively with simple meditation (
https://link.springer.com/article/10.1007/s11682-018-9826-z plus several other studies I could show you since this isn't even the one I was thinking of).
When it is "inside and outside" and unrelenting, I believe you are correct, you do not "get used to it". My strategy was to put one foot in front of the other over and over again, and resist the urge to kill myself or anyone else.
As examples of how fucked up I was:
Here is me trying to buy some obviously super-scammy "experimental device" from someone in 2014:
https://www.tinnitustalk.com/thread...around-quantum-biology.5670/page-2#post-61263
Here is me trying Potiga and getting burned by it, a drug I believed to be extremely dangerous:
https://www.tinnitustalk.com/threads/retigabine-trobalt-potiga-—-general-discussion.5074/page-190#post-133335
Here is me in 2015 talking about taking experimental drugs sourced from very sketchy places:
https://www.tinnitustalk.com/threads/experimental-nootropic-fasoracetam.8941/#post-116463
Note that all that shit was from the
end of my dark period. I wasn't even posting on here when things were really bad, but I could go find you some posts from another forum that
really show how f'd up I was, building faraday cages around my bed, coming home from work early to cry, experimenting with cutting myself with knives for the first time since I was a little NIN-listening wannabe badass. All these things, and more.
edit:
@PeteJ I will also point out that there are a couple sort of obscure benzodiazepines which are not used outside of Asia, and can generally be imported for personal use completely legally. Obviously without insurance there is some cost associated, and given that I think benzos are some of the most dangerous drugs in the world I feel awkward pointing this out. But, I know you have really struggled to find good medical treatment, and also I know that even with all the hell they have caused me, benzos are a big part of my quality of life now and I feel no shame about that, it is what it is.