An ENT consultant, looking into my tinnitus 20 years ago, suggested investigating my sinuses rather than my ears, and he was right. ‘Flixonase’, a powerful sinus clearer, worked wonders for me, reducing my tinnitus from a maddening 8 or 9/10 down to a manageable 2 or 3.
Only works where the sinuses are blocked and thus contributing to the imbalance, but worth bearing in mind.
The only thing that helped my sister's was grommets. I know sqad (and pretty much all doctors) say it doesn't make sense.... but it was the only thing that worked for her, after many years.
When she perforated her eardrum, she got it back again, and that time had to wait 10 months to get someone to agree to try it again. And again, it was gone within 48 hours and hasn't returned.