Tinnitus is associated with magnesium, B12 and zinc deficiency. Are you supplementing these? High doses(50 mg of each 2 or 3x a day) of other B vitamins may also help. B12 is hard to absorb. Some people make a paste from the B12 and put it in the nose for better absorption. If you don't want to do this, then try sublingual(dissolves under the tongue) B12 supplements.