I had the flue two weeks ago. It came sudden and I vomited about 10 times within a couple hours and had diarrhea a few times as well. I couldn't keep water down and ended up needing an IV bc i was so dehydrated. Now this weekend (2 weeks later) I'm going through all the exact same symptoms only this time I have cold symptoms too. Is it possible to have a flu twice in one month? or could this be related to something else?