While I disagree with the notion of unrecoverable brain damage being the most extreme scenario in what you describe and don't posses the medical know how to argue that your brain will always recover from self inflicted damage not relating to a TBI. Let's assume that is the case, the addiction was so deep and terrible that you are incapable of enjoying life as you once did. You have now made the choice to make a change, there should be comfort in knowing that no force in this universe is strong enough to force your hand to rape your cock, that will always be the case. You are left with two options, count days until some moment of serenity where you believe you are at an adequate level to function again. Or take control of the ship, accept your fate and ride out the nasty waves.

What I'm trying to say is that with any problem in life, part of the problem and in many cases the only problem is the stress resulting from your acknowledgement of the problem and fear that you will not heal. You are abstaining from the very thing that caused you grief, good job, it is literally as easy as you make it to be. You know what is damaging? Stress, fear, obsessive thinking, a 1000 day counter - where is the finish line? The day you die? There is no finish line, the light at the end of the tunnel is one big illusion, a stress inducing illusion. You were in the light the moment you finished your last fap. That was victory, stop counting and rejoice. 1000s of people have come out and verified that you are now healing. Celebrate your decision and don't give the past more thought than it deserves.

For anyone deep in depression I recommend reading 'The power of now' by Ekard Tolle. I am no psychiatrist but I do believe that the brain values self preservation over everything and most of our agony is self induced. If you're in the shitter it's mostly because you've chosen to define your reality as the shitter. I'm on my phone so I can edit later with scientific papers which touch on this.