Is Soul-loss is the main source of unhappiness in Western society?

The Soul is unconscious field of ‘feeling’ including all memories of your life. If you experience something unpleasant in a subjective sense is too crushing and the soul gets wounded. It happens especially during childhood when the capacity of rationalize the experience is not yet fully developed then the soul-less easily comes into existence.

Here the automatic reaction of the pain is to shield it off and try to forget it. Also this isolation is like a wall around everything that represents the experienced pain. The parts of the Soul are still linked to the life world, emotions and reactions of that small child.

Healing Soul-loss can be treated in a relative short time. It makes use of wider states of consciousness where transformation can take place. By transforming the pain and emotions at the root of the problem, one experiences a more balanced state at all levels of experience.

I don't believe in be existence of actual "souls" but I do think it is a good metaphor.. If you change the terminology slightly, it is exactly what therapy is supposed to help solve but often fails. The methods of therapy haven't all been tested very well and it is difficult to make a measure of "successful" therapy so people argue about which types and methods actually work.

If the "soul" is "unconscious field of ‘feeling’ including all memories of your life.", then you have not a scrap of evidence nor any reason to imply that there is such a thing as "soul-loss" is Western Society, nor that such a thing makes for unhappiness.
I would hazard a suggestion that happiness is probably much more prevalent in the west than it is elsewhere.
If you disagree with that, then maybe you ought to travel more.

The loss of soul is old. The soul died when Nietzsche proclaimed that God is dead.

God (and the soul) IS dead and Science has taken over the minds of the Western world.

The main source of unhappiness in the world is that science can only provide technology. Science cannot fulfill emptiness. Only relationship can but technology is the single greatest cause of people staying away from face-to-face connection.