There is a condition called testicular torsion where there is a twist that cuts off blood supply to the testicle. This would be an emergency. So if you are having pain there, it is important to check it out.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001545/
ARE YOU SEXUALLY ACTIVE IF SO THEN THAT IS WHY YOUR NUT IS SORE.AS TO YOUR ABNOMEN SEE YOUR DOCTOR.