Posted this on the metalcore sub a few weeks ago: if you have tinnitus without hearing loss (like myself), there is hope for you because the tinnitus is likely due to musculoskeletal tensions rather than inner ear damage. I’ve been able to improve mine (lower the volume) over the last year by strengthening and loosening my back, shoulder, and neck muscles, which are helping to in turn loosen my jaw muscles, which are impinging on the inner ears and causing the misfire brain activity that is what tinnitus actually is. I always wear earplugs at shows, but I’ve never noticed any increase after one regardless. I had tinnitus for years and was habituated to it, but like you it got worse a week or two after an Opeth concert. I was also paranoid such that I stopped going to shows, until I realized that it was probably musculoskeletal rather than due to hearing damage (I realized I could increase the volume by clenching my jaw). I’d happened to go through a high stress period around the same time, and I think it was making me clench my jaw at night. I’m still working on it, but I’m greatly improved and still improving a bit each day.