Im not a doctor but that sounds like instant death or brain damage to me.
To me everything is a circuit with the brain being the central command station. Its freaking out (system error message) because our circuit is compromised in some way and its not getting back the im ok im still attached to you message. Either we find a way to trick the brain into believing everything is still ok by bypassing the system, creating a new fake circuit to keep it happy or by restoring the input in an attempt to fix the circuit.
Pieces of brain get cut out all the time (tumours, brain injury etc)...it does not mean "instant death".
Look at all the lobotomies being performed in the 60's...we only use about 5% of our brains anyway.
I'm not saying to start blindly just frying the brain at random, but there HAS to be a small part of it somewhere, that triggers and/or sustains the Tinnitus...call it maladaptive neuroplasticity, call it something else but it is there.
All we have to do is find it and take it out, without disrupting anything else...laser already has the pinpoint precision capability to do so.
Honestly I don't see why this would be so impossible or inconcievable...as far as I'm aware, nobody is even looking into this, which is a big mistake...
We have the brain mapped out and the technology they wouldn't even dream of some 50 years ago, yet Jose Delgado was able to stop a charging bull in his track via remore linked to it's brain back in 1963!!..
He was also able to move peoples limbs against their will and induce any feeling from anger to euphoria amongst other things (even back then in pretty much dark ages).
Just immagine how far we have progressed from then.
Sometimes we need to think outside the box, instead of chasing our tails in 20 different directions.
The current approach is not working too well...the answer is hidden inside the brain somewhere.