Eat light, do not stay hungry but eat simple things like toast, porridge, cereals, crackers, banana, rice, peeled apple, etc. Take ORS. Take
over the
counter antacid and antiemetic (this SOS for vomiting). Watch out for a day or two with this treatment.
However, its important to rule out appendicitis as the cause of pain and fever, as this can be dangerous. Hence it is important to get un ultrasound or CT of the abdomen if appendicitis is suspected. Ask your doctor about it.
Take care!