well then save your game when the timer starts, enable the infinite health cheat if you are afraid of the moster killing you, and search every area.
Load your game if the timer is on the last seconds. Also, I had uninstalled this game some time ago, so I don't remember the location, but its in some bunker.
well exploration around the map will fix your problems. As I said, save and load according to the timer.
I do not remember the exact locations, but don't waste your time searching on open areas. They are in bunkers/rooms, etc.
actually its activated by default.