I was traumatized by the violent murder of a very close relative a few years ago and it wouldn't be in my best interest to watch movies like that. Can't do it.
Have you seen any of the old doomsday movies, the b/w ones from the 1950s? I like Panic in the Year Zero starring Ray Milland, and When Worlds Collide are very thought-provoking and exciting.
I liked Soylent Green and Logan's Run, which are moves from the 1970s that take place after doomday happened. Seen them?