It is important to rule out appendicitis in your case if you are talking about right lower quadrant (hence it is important to get an ultrasound or CT abdomen). Other than this UTI,
kidney infection,
gastroenteritis also needs to be ruled out. Drink plenty of fluids (clear soups, water, ORS in water, lemonade). Eat light, do not stay hungry but eat simple things like toast, porridge, cereals, crackers, banana, rice, peeled apple, etc.