All mental illnesses are treatable but no assurance can be given that they will not recover again. In that sense they are not curable.
Medications and Psychotherapy (Specialised counselling) will definitely improve the quality of all psychological / mental conditions.
Because psychiatrists are trained medical doctors, they can prescribe medications, and they spend much of their time with patients on medication management as a course of treatment. Psychologists focus extensively on psychotherapy and treating emotional and mental suffering in patients with behavioral intervention.