Post Traumatic Stress Disorder is unfortunately a common occurrence for anyone who attends a birth or works with people during their postpartum period. This can steam from both Secondary - trauma (the emotional duress that results when an individual witness' or hears about the firsthand trauma experiences of another person) and Vicarious trauma (the accruing effect of being exposed to someone else’s trauma — trauma that you have not personally experienced, but you’ve learned about from others, such as work related traumas from clients birth stories and experiences). 

Having witnessed a traumatic event can leave you  hurt, guilty and your brain consistently occupied with trauma. Birth workers can be left with lasting impacts after being present at a birth in which the outcome was undesirable. 
Compassion fatigue, or secondary traumatic stress disorder 
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After my traumatic birth with my first born I began my own healing journey. 
Certifications for debriefing supports include

Birth Story Debriefing with Dancy Perinatal
Sacred Story Keeping with Jennifer Summerfedlt
Trauma Yoga Teacher
Birthing From Within Birth Mentor