Please read the first article that a patient does not need to have a traumatic event to cause a severe mental disorder. It depends on how badly organ functions were hurt.
It also does not mean after a traumatic event makes the treatment becomes harder. Please read the second article. The key is the right treatment used?
For phobia, NLP works. Jump out of the box, there are more solutions with excellent results.
http://happypinmasterhealer.com/why-patients-have-abnormal-emotions-2/
http://happypinmasterhealer.com/emotional-disorder-acupuncture-treatment/