From The Anxiety & Phobia Workbook (New Harbinger Self-Help Workbook) by Edmund J. Bourne:
Fear. Fear of Fear. At times my fear was not based on anything concrete or real, just fear of the unknown.
The unknown seems to be involved in fear and terror. During the worst, fear of the unknown was a daily struggle. Something terrible was always about to happen.
Nothing ever happened but my own fear, cortisol and adrenal response system in the end. Our trauma fear is not real, a delusion, an illusion or just air. Fear not, because it is only us, our body functions and mechanisms working.