Happiness is the state of being that energizes our behavior. Rav Nachman of Breslov says it's the most fundamental energy from which everything else emanates. When analyzed, happiness is a feeling of positivity, optimism and goodness within; it's a feeling. But how does one achieve it? Feelings, after all are not aspects of self that can simply be willed. The answer is that there are three other aspects of our experience that we are able to ‘will’ and when we do ‘will’ them with positivity, our feelings will follow en suit. They are: thoughts, words and actions. If we modulate these three dimensions and become more accustomed at engaging with them positively, then we will feel better within and be happier. Moreover, with a happier more positive energy within, this in turn will influence the very three faculties of thought, words and action themselves to create a feedback loop:
Positive TWA (thought, words and action) stimulates positive feelings within, which in turn influences TWA that in turn influence feelings, and so on and so forth.
The aim is to learn better ways to think, speak and behave. The Torah is a remarkable guide with an entire system of mitzvos and rituals that target all three faculties so that through studying it, listening to its mussar, being inspired by its teachers, one automatically becomes stimulated to make changes and achieve the inner peace one desires.
However, some people have a harder time implementing changes by themselves and so they need a helping hand. While a rav or rebbe can help sometimes, many people need a more ongoing therapy, a little like physical therapy, where the individual is being helped in a systematic way to move the body in new ways that may be uncomfortable at first but in time will become more natural. A therapist does this with TWA, by helping an individual(s) develop better ways to think, speak and behave.
A therapist will also include a very important ingredient in the process too. Many times negative emotions are so locked in place that a preparatory and accompanying process of releasing them is also necessary. Some techniques include giving voice to the emotional experience, relaxation and meditation. We are blessed that built in to Torah life are these tools too. For traumatic experiences there is shiva and mourning which teaches us how to talk about our loss in a constructive way. For relaxation there is Shabbos and Yom Tov and for meditation there is tefilla. These are but a few examples of the therapeutic power of Torah.
For a Jew an ideal therapist might be one who can apply the Torah's directives to all the above. Perhaps you would call it Torapy.