My Son Has Been Given Antibiotics For A Throat Infection

My son has been given antibiotics for a throat infection following an emergency appointment yesterday. He seems to be getting worse, he is very sleepy, not wanting to eat, has had about a cup of water all day and seems to have a temperature. He has taken 10 tablets - 2 tablets 4 times a day. He says the light hurts his eyes and he is feeling nauseous.