text: loss of appetite and vomiting.  what do i have? about 5 days ago i got really sick and was vomiting all night, and then i had diarreah.  i thought that it could have been food poisoning, but i am not sure.  well, since then, i have had no appetite, and any little amount of food that i eat makes me feel ill to my stomach.  i usually have a great appetite and seem to eat too much.  i have lost 8lbs.  is this some type of flu or is it something more serious?  thank you. you might have a liver infection or gallbladder problems, or something else. go see a doctor. in the meantime, drink herbal tea and as much water as you can.