Subconscious mind is recorded all the information happen with us. In some situation we have a stress release feature sometime useful but the relation with stress causes long-term wellness and depression.
You Can heal yourself by three way.
Medicine (Control stress release system)
Hypnosis therapy ( go to setting memory and put few other related information to heal particular memory cell )
Affirmation ( help you to recover from old bad experience put other strong information on the same situation by repeating positive words )