Mental Health Support

I agree that self-image is an issue at the personal level. I think that personal problems arising from association of self with stigma is a level where your argument is correct. I don't think permanence of a mental illness really has anything to do with that at all.

Moreover I think your idea that mental illnesses all go away is mistaken. Some mental illnesses appear to incurable and potentially life long.

For example schozophrenia and bipolar disorder are incurable. Alcoholism is argued by AA to be incurable and at best in remission . Pedophelia and antisocial personality are argued by many professionals to be incurable especially for the latter when in adults. Which doesn't mean they can't be helped by treatment. But then physical disabilities may be permanent...but help by treatment.