Post traumatic would be a disorder that includes flashbacks.
Generalized anxiety disorder would be experiencing frequent and intense fear.
Obsessive-compulsive is an extreme fear of a specific object or situation such as, you see one book with the pages facing outward and the rest have their spine showing.
You can jog along the roads and countryside picking up litter, and you could also manually plant trees and other native vegetation in areas of sparse plant life to restore the habitat. You can volunteer with various programs dedicated to caring for the wildlife in an area. many of the volunteer programs require physical work to be done.