Keep people away from a sagging ceiling and call from a safe room. Do not stand beneath the bulge, press on the board, or climb up to inspect the cavity. Leave the building if you hear shifting or cracking that suggests structural movement; CDC guidance advises leaving when a damaged building makes unusual noises.
Water near a light fixture creates an electrical concern. CDC advises switching off wet circuits only when the main panel can be reached without entering standing water. Otherwise, leave the switching to an electrician.
Avoid scraping an old textured ceiling. EPA identifies asbestos hazards in older building materials; suspected material needs assessment before disturbance. Share the ceiling's condition during the call without opening it yourself.