Really sounds a lot like food poisoning. I've had the misfortune of getting it a few times in my life and it really defines the term, "violently ill". Sitting on the toilet with a pail or wastebasket on your lap and sleeping on the bathroom floor. No reason to get back in bed. Retching until your throat is raw hamburger after your stomach is empty. I feel for you, I would not wish it on anyone.
The old joke is that the symptoms of food poisoning are that at first you are afraid that you're going to die, then you are afraid that
you're not going to die. 
The only good news is that it normally completely passes in less than 24 hours other than the recovery and re-hydration of your body. There is no flu that I know of that would have made you that ill and passed by that quickly.