please look up http://www.emedicinehealth.com/testicular_pain/page6_em.htm#Testicular%20Pain%20Treatment
Have you checked the testicle, I hae epidydimitis which can be quite painful.
There are a number of things that could cause a pain in your testicle. but A quick call to the doctor
it may be due to some problem in urine system. i had some time also , but the best is to get immediately to doctor.