Hi, my stomach has been a wreck since I woke up this morning at 0600 throwing up. My throw up was basically clear since I did not have much in my stomach. It's been over 12 hours and accompanied with waves of nausea, cold sweats, and extreme discomfort. Tums and heart burn meds are not making it any better and it is difficult to eat. I had my flu shot in October and am not pregnant. What is wrong?