I feel you, yesterday i had the worst day of my 15 months, days like that make me want to kill myself. Today was always a torture but not like yesterday. If you don’t feel nothing then is permanent damage, but since you feel all your sympthoms then its your brain that known he have to adjust himself. Even if its hard its a nice things that you have sympthoms because this is your brain that tell you “something here is not right”’and it will keep adjust over time until you will heal.
Permanent damage mean that you don’t feel nothig, any kind of change, nothing at all, this is permanent damage, but if you feel the damage then this is your brain that is trying to heal himself.