The VAST majority of noise induced T fades in 6-18 months. I read that from a report from a Tinnitus expert, But I do not have it bookmarked. I'm sorry yours did not fade. Also, Lots of Noise induced T suffers on the website report significant improvement within 1 year (including me twice).
The authors themselves report most T improves significantly over time:
https://www.tinnitustalk.com/panic/
Sorry if you choose not to believe it.
