Have you had any second opinions? It sounds like your evaluator has given up on you, perhaps you shouldn't give up on you and find someone else who hasn't to help you.

This was the initial evaluation, but it is the English name used in Germany for dysthymia, which is long-term persistent depression, and has a low rate of remission (indeed they actually class remission as "has been given the mechanisms to cope with the illness" in the literature). Very few people recover from it, they just learn to live with it

The actual diagnosis was double depression, which is dysthymia ("permanent depression") + major depression (acute depression)

IME, nothing in this universe or life is permanent. It is temporality and impermanence that define our existence.

And for some people, who don't identify with that impermanence, it defines their call to non-existence.

There are definitely such things as life long ailments