pain from anus to scrotum

Sir i am 28 yr old . Past few days . Having pain in my anus to scrotum . My doc. Sujjest me sm antibiotic painkiller and cital according to him its UTI. Smtime i feel pain while sitting smtime i stand . Even after ejaculate it pains a lot. I dnt see any blood in my urine , stool ir urine .
plz. I need a guidance . This issue is getting worried day by day