Recurrent fever

My 6 year old boy had fever 30 days before and flu like symptoms and diagnosed with mild lung infection and prescribed antibiotics and his symptoms improved and last week his temperature increased and again went to a&e and insisted them to take blood and urine test…the results are normal and fever has gone after 2 days and again he got the temperature 37.7 and today we again went to a&e and they said he is looking absolutely well no need to worry if the fever above 38.5 for 5 days then come back otherwise no need to come they said…but i still worried that his temperature is 37.5 now and I didn’t give paracetamol as dr told as long as he is active and well no need ti give paracetamol and they even saying dont take the temperature too often….but am still worried….have any once experienced this before? Pls help me with your answers #firsttimemom #worried