I had DBS surgery approximately 6 years ago as part of a clinical study being conducted by the VA to study if soldiers suffering tinnitus from their service could benefit.
It didn't work for me and in some ways I feel it made my tinnitus worse. I really tried to find the settings that would help lessen the tinnitus, but I gave up and had the probes and generator removed 9 months later.
Afterwards, the tinnitus became so unbearable that I had to quit my job as an engineer and eventually retire; I could no longer concentrate.
I was told that others in the study found some reprieve from their tinnitus, but I was willing to toss the dice and see if it would help me and further science, health care to arrest this horrible affliction.
Still hoping some good can come from it, but time will tell.