Psychological First Aid
Link above is a comprehensive intro to psychological first aid. It’s responder-oriented but the principles and concepts mentioned can be used for one’s family, for self, for “stranger” disaster “victim” who appears out of nowhere into your immediate environment.
Some misc comments;
One of the best government agencies – my opinion only – with real good publications (no-cost to requester) is SAMHSA, a small agency of Dept of HHS. They have an A+ pocket size Field Manual titled “Field Manual For Mental Health and Human Service Workers In Major Disasters”. A favorite line I photocopied:
“Disaster mental health assistance is often more practical than psychological in nature.”
For your psychological first aid research do learn about the topic called “compassion fatigue”.
Keep notes and understand that they’re restricted health care information.