Hello dear, As per your symptoms,your child probably had throat infection(pharyngitis) with associated ear infection. Children of this age have chills associated with fever and this abdominal pain is also explained with pharyngitis .We commonly call it tonsils tummy. In high grade fever the child can get sick enough to look pale when he is not and the greying of nails can be due to imporoper oxygenation. You should consult your doctor for proper evaluation,physical examination and management. I would recommend oral antibiotics like amoxicillin and antipyeretics like paracetamol. Hope it will help. Stay blessed :-)