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Materia Medica Viva Volume 3 – page 532

These examples are indicative of the peculiar sensitivities of Arnica. In view of these facts it is now easy to understand the different symptoms as they appear in the repertory such as: "Fear of others approaching him, lest he be touched. Has fear, apprehension, dread of being struck by those coming towards him, etc". The idea of causation because of a "blunt" shock runs through the remedy and affects the mental condition as well. The symptomatology of Arnica will develop after a mental shock such as fright, anger, fury, loss of fortune, overexertion etc.
It is my opinion that, in the near future, we will see proof of the existence of areas in the human brain concerned with the "instinctual mental defences" of humans. These would open and close automatically once fear or shock are over. In our contemporary society however, once these areas are triggered by a fright (mental shock), they remain in a state of permanent "excitability", that is to say, open. The person thus suffers chronically as though there were a repetition of the frightful experience every day. Why this should happen is not a question that we are in a position to answer today in detail. I have given some suggestions on this point in my book "A New Model of Health". The fact remains that, in today’s world, people suffer far more frequently and easily from mental symptomatology than was the case in the past.
As the mental pathology travels deeper, we get severe anxiety states that originate from such shocks or overexertions. There is fear and anxiety that could be called hypochondriacal. In the Arnica anxiety states it seems that fear goes quickly into the subconscious mind and emerges every night during sleep in the form of a crisis, often several times a night. The symptomatology is similar to that of Aconite, Argentum nitricum or Lachesis and you will have to make a differential diagnosis. There is a tremendous fear of imminent death during the night, on waking up from sleep, which is triggered by a feeling that something is wrong with the heart. These states appear especially after an accident. There is a kind of cardiac distress, an anguish that originates from the heart region, a feeling that the heart will give in suddenly and he will die instantly. The idea of dying instantly is characteristic of Arnica.
Kent describes the state beautifully: "Horrors in the night. He frequently rouses up in the night, grasps at the heart, has the appearance of great horror, fears that some dreadful thing will happen. A sudden fear of death comes on at this time, he grasps at the heart, and thinks he is going to die suddenly. He is full of dreadful anguish, but finally comes to
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