His testicles are hurting n swollen his back and stomach aches and it's hurting some when he urinates?

Infection: These symptoms are concerning for infection or possibly what we call torsion (twisting of the testicle) and I believe he needs to seek medical care now. Good luck

He may: have PROSTATITIS, SEMINAL VESICULITIS ( Bacterial infections of the prostate gland or the tiny sacs which store sperm)....IN SHORT this REQUIRES a "HANDS ON" examination, Diagnosis , and Treatment (probably with antibiotics! Do not delay .seek ER or URGENTCare Unit help! Dr Z