I feel hungry but when its time to eat then i can't even finish my food, i am just very thirsty, i had a cold a few days ago, what could be wrong?

Stomach Flu : If your symptoms just started after your recent "cold"; then you may be experiencing irritation of your stomach by your "viral infection". Something that people call it: "stomach flu". In this case that usually may last a few days; warm liquids: soups; warm tea/ milk ; non-spicy food would be better. However, if your symptoms persists beyond a week or two, then it is better to see your doctor.