After that I sent another letter to the remaining professors of mathematics whom I could find out on the home page of the university since I got no answer yet. I have received no answer from them. If you have met a similar refusal, please write to the relevant people to inform them the state of affairs and ask for help as I did. I had met similar refusals from other journals before. Mental disease is said to be not rare.
Most people presumably know of mental disease.
However if a psychiatric is close to you, in your office or home, you sometimes are not aware of that. A psychiatric is sometimes unaware of his own mental disorder. If he is aware of his mental disorder, he often cannot see a doctor by himself. The family should take care of and bring him along to a doctor. Colleagues should do so if necessary.