How did your tinnitus start? Did you get tinnitus due to loud noise?
Do you have hearing loss?
My vitamin B12 level is 376 pg / ml. It's not too low, but I started taking vitamin B12 today.
Now I'm trying to get used to my tinnitus. I hope I can succeed. Has your tinnitus level ever decreased?
I think I had accumulated hearing damage from concerts over the past several years, and a few days of driving around with loud music (probably 80-90dB, not sure) and/or a night of headphone use (I listened to an hour-long album) was the straw that broke the camel's back, for me. I think. There's no way for me to tell what exact moment I started having tinnitus.
Mine has gotten better, though I can't tell if I'm just habituating/getting used to it, or if I'm actually healing or not. Some days I barely hear it unless I listen for it. Sometimes it gets louder and I have to turn something on (music, a fan) to drown it out. But in general, it's giving me less anxiety. I've been avoiding loud sounds and wear earplugs if I'm using something loud like a blender, but I still listen to music in my car (just quieter now, tested with a dB app).
I had my blood tested for unrelated reasons, before I got T, and my vitamin B levels were normal (in fact everything was normal).
Something that has helped me is—especially with acoustic or noise-induced trauma—there's not a whole lot we can do right now. That may sound depressing but once you stop trying to look for answers and magic solutions and start trying to live a normal life, even trying to ENJOY life, you'll start to notice the T less. It sounds like yours has been really tough to deal with and is fairly noticeable, but humans can adapt to anything. I think spending less time on these forums has helped. It's nice to know this community is here if, god forbid, mine gets worse, but don't make tinnitus your life.
Best of luck and good health to you.
Edit: that being said, I don't think it can hurt to try supplements such as turmeric, vitamins, anything anti-inflammatory. Keep taking care of your overall health as well as your ear health. CBD helps with my anxiety, too. I'm not a doctor, just offering some suggestions/reassurance.
Edit #2: Your tinnitus seems to be very sensitive to any changes in sound. I haven't notice mine get better/worse in relation to any noise (though I don't live in quite as a noisy environment as you do). Perhaps something to talk with your doctor more. I think it may be a sign of hyperacusis, too? I hope you find some answers soon!