On Monday, my uncle who lives with me and my grandfather suddenly had it coming out of both ends. I have been worried about catching it ever since. It also worries me when people say it came on all of a sudden. Do you find when you have norovirus (which is what he had I'm sure) any proceeding symptons that make you think you may vomit or have diarrhea. I remember when I was sick two times my stomach hurt really bad and I didn't feel like eating. My worst fear is being out in public and then suddenly it comes out of both ends.