No. Not only cannot one heal without the help of a psychotherapist, one cannot heal without the help (in some cases) of a psychiatrist. It always depends on the severity of the depression and the impact it has on the individual’s life, but it is necessary to get help from mental health professionals. Even in severe cases of depression, the best combination to treat it is to combine pharmacotherapy and psychotherapy. I enclose some scientific articles for those interested in learning more about it.