Dr. I don't hve appetite to eat and no hungry. But I never eat for 3days ready once I see the food like want ti vomit and im so weak ready.

See a doctor. This is a very disturbing set of symptoms and could be caused by several serious illnesses. I recommend that you see your doctor as soon as possible.
Appetite. See a doctor asap to find out why you have no appetite and why you feel loke vomiting when seeing food.