Sharleen, oddly, I was just listening to a CBC broadcast about a norovirus outbreak in British Colombia. I was struck by the comment about "projectile vomiting" without the normal advance warning of nausea. Does that sound like what's in your area? If so, it lasts a few days, and is extremely contagious, and is still contagious 2 days after one feels well again.
I wonder if it's hit your hood? It started in Britain a few months ago, as you can read here.
You might be able to hear the CBC program here, although it's a long.