Stressing out over tinnitus is a losing game. There is no rhyme or reason as to how and why we get tinnitus or when it may resolve, if it ever does. I have had tinnitus for over a decade. It gets very loud sometimes then, without any changes, it will lessen. A glass of cold water can trigger an increase in volume.

The best way to deal with it is to try to ignore it. The PCS brain tends to get obsessed with little stimulations. Trying to refocus on a distraction can be helpful. Sometimes, music or other background sounds can help.

I would not hold hope the stuff your neuro has you on will help with your depression. They are mostly memory aids. A broader B vitamin supplement might be worthwhile. L-Tryptophan and L-Theanine may help, too.