- Hearing loss and/or age
- Blood pressure
- TMJ (jaw/dental issues)
- Posture issues
There's a company in Ireland (Neuromod, I think) that has a product like this that seems to be able to work for some tinnitus sufferers, but not all - possibly owing to the differing types. FX322 is a hearing-loss drug that works via stem cells and has shown promising results in treating the hearing loss angle.
If yours is TMJ or blood pressure, though... you need an entirely different plan of attack.
Posting this comment mostly because I really get tired of reading threads where this isn't acknowledged; no one cure fits all. I've had it since I was a child and while habituation does factor in slightly, I think wider understanding of this all needs to be out there.