Consider using a TRT[1] Tinnitus hearing aid. It was prescribed me by my ENT doctor and it provides me with great relief. My Tinnitus is persistent and extremely loud. Loud enough that I couldn't get use to it even after many years. I'm not sure what would be the procedure for you to get one in your country. It is not a cure, but it made my life immensely better. I wished I had gotten it sooner. Good luck!

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[1] Tinnitus Retraining Therapy