No one in emergency services is immune to this, regardless of past experiences or years of service. Your loved one may experience critical incident stress at any time during his or her career. Suffering from the effects of critical incident stress is completely normal. The symptoms will normally subside and disappear in time if you and your loved one do not dwell upon them. Encourage but do not pressure your loved one to talk about the incident and his or her reaction to it.
Talk is the best medicine.
Remember that if an event is upsetting to you and your loved one, your children may be affected, also. They may need to talk, too.