Thanks for your query.Based on the facts that you have posted it appears that you have
pain in testicle,anal region and lower back since couple of days. This is most likely to be due to infection of the Prostate( Prostatitis
However final diagnosis can be confirmed only on clinical examination and Digital rectal examination
by a qualified Urologist and some basic tests like Routine urine test and Ultrasound
scanning of the abdomen,.
Please do not hesitate to consult Urologist
In the mean while Please take broad spectrum antibiotics along with anti inflammatory medicines like Diclofenac
twice daily .
Get the prescription of medicines from your family Physician.