The intellect releases one thousand thoughts per wink of the eye. And these thoughts have to be processed. Each thought becomes either a Feeling , Emotion or Desire. When your desires don't work out, you feel upset. When you don't have intuition to guide you, mostly you won't get your desires fulfilled.
Unfulfilled desire becomes neurosis, and that can develop into psychosis.
All thoughts and feelings go into the subconscious. When that gets filled up to overflowing, the excess spills into the unconscious, and that becomes the source of nightmares for you. Once they fall into the unconscious, those attitudes, feelings, and habits are extremely difficult to reach to change or modify, much less eliminate. When painful, negative thoughts and feelings come out, let them go on by. Keep bringing your mind back to focus on the manta you are chanting.