Man, that sucks. Stomach pain is something that we can't endure and when its bad, its really bad the the man facing it can't even say how the pain is.
Its good that the pain went away but shouldn't you think about why the pain came cause I believe you won't want to feel the pain again. Maybe don't eat fast food for some days and eat green foods and salad more and more. Saline drink can be a good thing as well.

And btw, how did your girl friend knows about the flooding situation as she was not with you at that time?