After the accident, he started seeing a trauma therapist to cope with the emotional impact.

therapist 是由名词 therapy（治疗）加上后缀 -ist（表示"从事...的人"）构成的名词，指"治疗师、理疗师"。trauma therapist 特指"创伤治疗师"，专门帮助人们应对心理创伤的专业人士。