Thanks for your query,Based on the facts that you have posted it appears that your father has Orchitis
.Please consult qualified surgeon or Urologist
for clinical examination and get his Ultrasound
scanning of the scrotum
and Routine Urine test done Continue taking the antibiotics along with Brufen 400 mg twice daily.This drug is available over the counter.Pain and fever will subside in 4-5 days.