Thanks for your query.Based on the facts that you have posted it appears that you have discomfort in your left testicle and you have consulted three physicians and allt of them have diagnosed it to be Epididymitis
This can be confirmed by Ultrasound
scanning of the scrotum
. Though you have no relief with Diclophenac you need to take Broad spectrum antibiotic and continue taking anti inflammatory medication like diclofenac
for 2 weeks to combat infection.
Get prescription of the drug from your family physician.
It will get cured in 2 weeks, Dr.Oatil.